Malicious PDF — malware analysis report

Static analysis result for SHA-256 18139cfff954f94b…

MALICIOUS

PDF

45.0 KB Created: 2020-08-02 21:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8973442173f3f3a98340e2819de73c7 SHA-1: 5036212fa5e253d777c145e9deb87c276b4bd81b SHA-256: 18139cfff954f94b812a57043ea2ba3d7fcac867e4aa1a219cab8f03bbd0528d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm, indicating a probable SEO spam or phishing campaign. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the embedded URLs suggest an attempt to lure users to external, potentially malicious, content.

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.ru/pify?keyword=the+raw+shark+texts+pdf
    • http://files.dmaastarkville.com/uploads/1/3/1/4/131452800/gamafexetajabijimu.pdf
    • http://files.deafplanetsoul.org/uploads/1/3/2/7/132710563/zenog.pdf
    • http://files.millermiller.info/uploads/1/3/0/8/130813796/bibumilowotaxup_pixepezozefe_sifane.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/21211808384.pdf
    • https://cdn.shopify.com/s/files/1/0428/9226/3583/files/99073412513.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90278046640.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9477/files/51738584332.pdf
    • https://cdn.shopify.com/s/files/1/0428/3816/3623/files/rurebakivupejim.pdf
    • https://cdn.shopify.com/s/files/1/0439/3123/8555/files/mufafowinedaxesaloxap.pdf
    • https://cdn.shopify.com/s/files/1/0432/1175/1579/files/91197629737.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/livoxigugefeguvon.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5360/files/sewebumerupuvefitemogun.pdf
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/kezeb.pdf
    • https://cdn.shopify.com/s/files/1/0429/6438/5951/files/2338735599.pdf
    • https://cdn.shopify.com/s/files/1/0429/9912/0033/files/37254801009.pdf
    • https://cdn.shopify.com/s/files/1/0434/5511/9512/files/rekafugawowu.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_off00007342.bin
59e25b900cf85e0e0c4f3f689a78c3037ee1255cdd16093260c70a35d425ef06
pdf-font-stream PDF embedded font (sfnt) at offset 0x7342 5272 bytes
font_01_sfnt_off0000853d.bin
03e043606ea3b27f0d27c260d430265b5c2c03fb69f13dc7c47be3d5d3b24491
pdf-font-stream PDF embedded font (sfnt) at offset 0x853D 9896 bytes