Malicious PDF — malware analysis report

Static analysis result for SHA-256 19715dc4cd1798ae…

MALICIOUS

PDF

44.0 KB Created: 2020-10-31 10:33:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d66de5d84015de51c6680938a222ae5d SHA-1: 2186578b4381e8378cf21824d120a5d0a0611b47 SHA-256: 19715dc4cd1798aebceaec172a5004ef0406d2b97372ab769fec0bfa86648849
154 Risk Score
Tags
free-cdn-ebook-manual-lure

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 1.0000

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://ggtraff.ru/123?keyword=superwinch+terra+4500 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389804/normal_5f906ea05d6e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383128/normal_5f8f96e9075ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/51597322-6d26-412a-8e6e-197d33e6a09b/77656036339.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/3157/8782/files/move_contacts_from_android_to_ios_app.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1415/9040/files/taylormade_r11_driver_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/5402/9720/files/sunderkand_free_download_gita_press.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0460/3704/1331/files/door_fitting_materials_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4855/9004/files/5180393732.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/9100/6888/files/valley_vet_promo_code_february_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/2304/1190/files/town_hall_9_war_base_no_xbows.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4993/4229/files/biparerevowatibotarepu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7be2409d-ea19-4079-bbe9-647023bf3e29/sowazatopeve.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4422/7230/files/competitive_math_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7855/7095/files/ratchet_and_clank_ps4_achievement_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1328dffb-8644-43b4-b526-90bfcac838f0/72529110692.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
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CAD 5360 bytes
SHA-256: 7655a5e455a4053a2a867beedfd0b827d656b732f6a21975f37c91c2fdc57f2c
font_01_sfnt_off00006ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF9 6148 bytes
SHA-256: 488ffee5e9c33bcc1f3f00aec749f35977d0cdd209ffadaee35194d66ecc177d
font_02_sfnt_off00007ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED9 10832 bytes
SHA-256: dc7c56a2ac471c7a4f806877558efe60d5d33d94dfb2d00cdea1cc199b3d816c

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