Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e51d0f5c30ca49…

MALICIOUS

PDF

68.5 KB Created: 2020-10-31 00:08:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9e87f0cc784519f681e9c321edcf73c9 SHA-1: d7bc20b1f97b03f5d9137f577fcce06012d9020e SHA-256: f8e51d0f5c30ca49b8e3923b080fb88b045af194faf22abcdab9f6185afd3603
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.me/123?keyword=d%2526d+pathfinder+breastplate In PDF document text
    • https://lebidupevi.weebly.com/uploads/1/3/4/3/134319251/6105905.pdfIn PDF document text
    • https://farupixin.weebly.com/uploads/1/3/4/3/134314126/a43d33715160e40.pdfIn PDF document text
    • https://gemenudotipetal.weebly.com/uploads/1/3/2/6/132695720/lopaxarusiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3526/3130/files/uniform_commercial_code_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9150/0452/files/ikea_micke_table_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1871/4788/files/hipstamatic_for_android_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2176/1194/files/central_angles_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/5802/0519/files/wepekasotakidepo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/338a6ec5-fe3c-48c5-be41-89d868694d7b/23946792135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ebc489d-3e6c-4cdf-a793-8d031888edbf/70266160248.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7961/2616/files/37207457138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc73c273-f912-4788-a4c0-a45959b91bad/best_teas_study_guide_2017.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5743/0176/files/valuation_les_nombres_dcimaux_cm2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6230ec3-463f-4df3-a399-804668fa3d53/5250799579.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7990/2392/files/grahams_law_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6984be47-0819-41b7-b90b-d19a82481b8e/98522304468.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off0000f2d5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF2D5 6504 bytes
SHA-256: 0b720450c5d4f5dc26dcb4bfcf1ca09c0f414f81811f4845182a31edefe8a295
font_00_sfnt_off00006e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E18 7516 bytes
SHA-256: f94b7a9f9b44941a4729198749c0cbc3315ace3331c2b5ac0660dfc4562f3e09
font_01_sfnt_off0000819e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x819E 3148 bytes
SHA-256: 9cb16e24caae0cda5f696f8515c9caf552c5cb8182508cb5a6b41535a3d08d09
font_02_sfnt_off00008cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CDD 4156 bytes
SHA-256: 5ae3bcc49c87f96444fbe3d11ff27db43b6aea299416b9f3d286273c64098da8
font_03_sfnt_off00009acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9ACB 6280 bytes
SHA-256: 2747466b0012945aafe0ad02a2c7c5c13d1e8884b8af0ce960b6ed9c3f1811fe
font_04_sfnt_off0000aa33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA33 16084 bytes
SHA-256: 98c35c6f9db9a76e3641489bf1ac5154093171225e0e7d996228aed0844984c3
font_05_sfnt_off0000dc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC35 16516 bytes
SHA-256: dcc04cc433837b3986e479babf093185dc6d099fad3e8bd8e79ac44911b58e95