Malicious PDF — malware analysis report

Static analysis result for SHA-256 177a03e38453ddb2…

MALICIOUS

PDF

39.7 KB Created: 2020-08-30 22:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b042cee3e60747583ab8ba0908552a25 SHA-1: 4ed35e91c1ebd6453ebb4e0e8791e24a6848b450 SHA-256: 177a03e38453ddb24cddce21d6e65bb277f21fac4d440187d732599941b875bc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, a common tactic for SEO link farms and redirecting users to malicious sites. One prominent URL, 'https://ttraff.ru/wix?keyword=samsung+32+inch+tv+manual', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF links, suggesting an attempt to disguise malicious activity as legitimate 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/wix?keyword=samsung+32+inch+tv+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_31b9de4785a74f6d8c7e70ad1ce593df.pdf
    • https://static.usrfiles.com/ugd/b65acf_bda66ae848934215a9be1dcf414c8fe2.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0b5ff1970514d519f44d030132db0d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_c0d43d1519814115b32301c81109aad9.pdf
    • https://cdn.shopify.com/s/files/1/0435/1547/8176/files/susujosalolazaziraguwi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4669/files/japeriv.pdf
    • https://static.usrfiles.com/ugd/d902bb_06d3163a04934365a672b734dc6e4ebe.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d1145e8a3264e6b93c0dce3e7f1780e.pdf
    • https://static.usrfiles.com/ugd/b8c837_3dac6d33d23745beac1c2bc26ccdf979.pdf
    • https://static.usrfiles.com/ugd/affaa6_7a8d414ff2f343d9b63dc671d0f9dfa0.pdf
    • https://cdn.shopify.com/s/files/1/0432/2630/0575/files/vebomusibisutukabisafuzu.pdf
    • https://cdn.shopify.com/s/files/1/0440/7702/3384/files/el_viraje_de_la_filosofia_moritz_sch.pdf
    • https://cdn.shopify.com/s/files/1/0432/2351/5294/files/luxubusisepu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6481/1935/files/4419326844.pdf
    • https://cdn.shopify.com/s/files/1/0428/4612/6247/files/52523412737.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_off00005056.bin
bc5161077e4311a0362cf4b855b094da2c41dfdb9c52f316546368997b3c881f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5056 5228 bytes
font_01_sfnt_off000061eb.bin
52b11f9ad17cf74a0645ead515e639eed3782a5e0e900794f823f9063e9b0357		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61EB 9984 bytes
font_02_sfnt_off00008426.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8426 4324 bytes

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