Malicious PDF — malware analysis report

Static analysis result for SHA-256 04489f3483e1dd34…

MALICIOUS

PDF

39.2 KB Created: 2020-08-15 03:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5de0124360bd85983d2418eba1316a8b SHA-1: 62c753e6d246f9b2e8e37dde1bffc0088bae05ed SHA-256: 04489f3483e1dd348b8dcc03ef98450d99c61eca5107d83ed200149f88a00d8a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous external links, including one pointing to a known malicious redirector. The document body, though partially corrupted, contains the same malicious URL, suggesting an attempt to lure users to malicious content. The ML classifier also strongly indicated maliciousness.

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://ttraff.com/pify?keyword=forest+animal+worksheets+for+preschool
    • http://files.angryorange.org/uploads/1/3/0/7/130775677/vajidijutegeva.pdf
    • http://mapitalen.philcuba.org/uploads/1/3/1/1/131163943/9aaa947fd.pdf
    • http://files.heart2heartknittingfiberarts.com/uploads/1/3/2/8/132814611/susufiku_gofunolune_tasitabukulije.pdf
    • http://files.isolationdrawing.com/uploads/1/3/2/7/132710569/xoriborovetir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/5187/4466/files/bookeye_4_kiosk_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/7048/8730/files/tapatigoba.pdf
    • https://cdn.shopify.com/s/files/1/0437/3587/5749/files/absalom_and_achitophel_summary_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/5475/9065/files/womens_comfy_platform_sandals_uk.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5684/files/apprendre_le_suisse_allemand.pdf
    • https://cdn.shopify.com/s/files/1/0435/8488/0798/files/10463197660.pdf
    • https://cdn.shopify.com/s/files/1/0437/2021/2645/files/mastering_astral_projection_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/2491/6388/files/kegujukuwewib.pdf
    • https://cdn.shopify.com/s/files/1/0433/7080/7459/files/the_ugly_duckling_story_for_kindergarten.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3702/files/tit-_for-_tat.pdf
    • https://cdn.shopify.com/s/files/1/0430/3618/0634/files/cell_parts_and_functions_matching_worksheet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005af8.bin
f483394f1dd2ff660c2eafdbf36e964ff19657a18296ef3e7a3aca5bb1c29c10
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF8 5364 bytes
font_01_sfnt_off00006d23.bin
0da0f828dff16c146aa338f61a520fdda13b699887a2fdd483d648c0eb83fe3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D23 10164 bytes