Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1775da5f7e4eaa…

MALICIOUS

PDF

42.7 KB Created: 2020-08-23 09:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c92b8ddb20d3e5dd12928cdb7f58ae1 SHA-1: 3838a7f32ef8256f29b024362ad2699aa9fe1407 SHA-256: 5e1775da5f7e4eaa83d4aff70a7ec0d8b9cceb73d6a52571575a82df76bedbda
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one to a known malicious redirector, disguised as a refrigerator manual. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or SEO manipulation. The primary malicious IOC is the redirector URL, which likely leads to a further stage of the attack.

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.cc/pify?keyword=whirlpool+refrigerator+manual+wrf555sdfz
    • http://files.leopardpineapple.com/uploads/1/3/1/3/131398555/761014.pdf
    • http://lileza.laplayaatthestrand.com/uploads/1/3/2/6/132680981/gumomuraxi.pdf
    • http://valowu.straightpipeexhaust.com/uploads/1/3/1/6/131606490/ravegupixusup-jajijoguwifav-fazuko-gibozureju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6156/5850/files/55349507769.pdf
    • https://cdn.shopify.com/s/files/1/0434/4902/4669/files/15544485593.pdf
    • https://cdn.shopify.com/s/files/1/0437/3161/5909/files/axolotl_facts_and_information.pdf
    • https://cdn.shopify.com/s/files/1/0435/2330/9727/files/algebra_nation_book_answer_key_section_2.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9874/files/sample_project_scope_statement.pdf
    • https://cdn.shopify.com/s/files/1/0427/3173/3159/files/ravovixogifefisimunelinaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/4298/7423/files/mathematics_teachers_guide_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/git_rename_a_branch.pdf
    • https://cdn.shopify.com/s/files/1/0434/1900/9189/files/wavubebe.pdf
    • https://cdn.shopify.com/s/files/1/0433/8660/1639/files/ciclo_de_vida_de_bemisia_tabaci.pdf
    • https://cdn.shopify.com/s/files/1/0431/6653/1741/files/philips_universal_remote.pdf
    • https://cdn.shopify.com/s/files/1/0435/7731/1391/files/zupixetitafiket.pdf
    • https://cdn.shopify.com/s/files/1/0437/5016/2583/files/libro_balun_canan_gratis.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_off0000590e.bin
9a2df3d4941effb445c3dde02debf237b46d0c97fbca3ef58b3c077a2e115fd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x590E 5732 bytes
font_01_sfnt_off00006c8e.bin
1e872212e0f76238d9ea47072e185dc67b7a093512c761cf49318b161217eb4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C8E 15364 bytes

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