Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b553ed588324957…

MALICIOUS

PDF

42.6 KB Created: 2020-08-16 12:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b985bac9ee9290e75721f173a0f25590 SHA-1: 9ac0511f0272242ca474d827d686cd69336c4dd0 SHA-256: 5b553ed5883249576e688cbdfc47640eef46b2bb051b4b075f65cda7c0262ff0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same URL as the malicious redirector, suggesting an attempt to lure users to 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/wb?keyword=adaptation%20worksheet%20grade%204
    • http://files.alexlitsoudis.net/uploads/1/3/1/4/131453919/benoxovazekiv.pdf
    • http://files.retailfanhubnw.com/uploads/1/3/1/8/131856539/c1d59d1f.pdf
    • http://files.jessejonesioofpark.com/uploads/1/3/2/8/132814071/5215711.pdf
    • http://files.muckabout.ca/uploads/1/3/1/4/131407102/vokemoxumab.pdf
    • http://files.sand.penguinprof.com/uploads/1/3/0/7/130738991/3b43d0d7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2041/9226/files/setolewozaxabavuguminizew.pdf
    • https://cdn.shopify.com/s/files/1/0432/5448/1054/files/33487502943.pdf
    • https://cdn.shopify.com/s/files/1/0432/1175/1588/files/95430174064.pdf
    • https://cdn.shopify.com/s/files/1/0437/6995/4453/files/wosetametelijapimoxejupur.pdf
    • https://cdn.shopify.com/s/files/1/0429/7195/5351/files/badexiperofikabob.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/liwisubusamepumiv.pdf
    • https://cdn.shopify.com/s/files/1/0427/4218/6150/files/kogobelu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sivezijikok.pdf
    • https://cdn.shopify.com/s/files/1/0445/4517/9807/files/logical_reasoning_aptitude_comprehension_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/1567/5815/files/nopiwi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/certificado_antecedentes_contraloria.pdf
    • https://cdn.shopify.com/s/files/1/0430/4034/2169/files/fluke_fishing_reports_ny.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_off000067be.bin
a5e303d91b2a0ddd64bc2b98cd2246e3a2eb4cadbc38f98b38dc695f1926be39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67BE 5424 bytes
font_01_sfnt_off00007a42.bin
d8e152bfe6aab4364afb4a30290856c0480adcb108b56b756cb997ebb2d4d139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A42 10364 bytes

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