Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ed751a74027c0f…

MALICIOUS

PDF

43.4 KB Created: 2020-08-12 07:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 583ebc347521953d0bfdbf7141f35f44 SHA-1: 0f54d054dee9f83e0dff047f51a177dff2cfbb97 SHA-256: 16ed751a74027c0f050b71d6f4a7bac4c5f3ad24063fd136347fd6a19fc1ce0c
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one identified as a malicious redirector pointing to 'https://ttraff.com/wb?keyword=geografija%20za%206%20razred%20pdf'. The document also features a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the overall structure points to a phishing or redirection attempt.

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/wb?keyword=geografija%20za%206%20razred%20pdf
    • http://rudezij.gainesvilleinsurancecoverage.com/uploads/1/3/1/3/131383483/gutozijarowe-xukaviralej.pdf
    • http://guxum.carlya2z.com/uploads/1/3/0/8/130874592/7d7c74c65d089.pdf
    • http://files.secondbaptistwalworth.org/uploads/1/3/2/8/132815298/c58c53868b.pdf
    • http://jevow.j2theson.com/uploads/1/3/2/6/132695578/vovada.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/7299/2918/files/debuki.pdf
    • https://cdn.shopify.com/s/files/1/0435/2707/8042/files/zavowigokifinesojukazuser.pdf
    • https://cdn.shopify.com/s/files/1/0434/1681/3735/files/71777539410.pdf
    • https://cdn.shopify.com/s/files/1/0438/4532/0861/files/wuxewafalejerefanotupix.pdf
    • https://cdn.shopify.com/s/files/1/0429/0389/6217/files/lineguz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuwuvedalolavotidexetugom.pdf
    • https://cdn.shopify.com/s/files/1/0429/9007/6057/files/xotinus.pdf
    • https://cdn.shopify.com/s/files/1/0434/8228/4194/files/minnesota_driver_s_license_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/7086/6076/files/gutawetavedekadafek.pdf
    • https://cdn.shopify.com/s/files/1/0435/9254/8511/files/59482303063.pdf
    • https://cdn.shopify.com/s/files/1/0431/9933/2512/files/samovojesi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7753/2824/files/98890748331.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/50306279194.pdf
    • https://cdn.shopify.com/s/files/1/0429/3902/3526/files/fusupe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bf4.bin
f173851b56047c357a59d5db83c225c0461256ea3b64798dad35b801309f7d28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF4 4912 bytes
font_01_sfnt_off00006cc6.bin
824c4edf0925d62f080d62a25e0fc6c210e8fe315780734014a596c6a22c8f4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC6 11192 bytes
font_02_sfnt_off0000912f.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x912F 4324 bytes

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