Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a081098dd91f697…

MALICIOUS

PDF

44.2 KB Created: 2020-08-04 09:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17c0e2973c78b608c9aee62258841728 SHA-1: 761cb4ab0a8bbe17d578dd7f84d93bad03ee2867 SHA-256: 0a081098dd91f6977420d476fc41c4e55676bf964e779313cf617bf8b76bc3b2
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains text related to 'business environment text book pdf' and includes the malicious redirector URL, suggesting a lure to download potentially harmful content. The ML classifier also strongly indicated maliciousness.

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=business+environment+text+book+pdf
    • http://files.anthonyhains.com/uploads/1/3/1/4/131408024/2060583.pdf
    • http://files.leightonbuzzardpropertyblog.com/uploads/1/3/1/3/131398142/zolim.pdf
    • http://files.westvillageclothing.com/uploads/1/3/1/4/131407214/rigogiw-kupezufubuvop-kasuvagado.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/2853/7753/files/fadakosojaxojigemup.pdf
    • https://cdn.shopify.com/s/files/1/0429/6625/3724/files/40339352365.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7034/files/college_physics_volume_2_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/birovej.pdf
    • https://cdn.shopify.com/s/files/1/0437/0569/6407/files/41572146750.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wexidemunuviviradepinitim.pdf
    • https://cdn.shopify.com/s/files/1/0432/9829/1870/files/futex.pdf
    • https://cdn.shopify.com/s/files/1/0434/5063/0296/files/94797420351.pdf
    • https://cdn.shopify.com/s/files/1/0433/8001/5262/files/67107403728.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3288/files/tolarubu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0654/9406/files/musirijanofudigifum.pdf
    • https://cdn.shopify.com/s/files/1/0429/4747/7667/files/wejupubolegenusek.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1542/files/80257821027.pdf
    • https://cdn.shopify.com/s/files/1/0432/3760/5544/files/61140621126.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_off00006175.bin
cbcb1e45f1ec3fba2a61915b08883f45156486eff6668960bcaf2165232010ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6175 5208 bytes
font_01_sfnt_off00007310.bin
942aec198558b1ec7c41f6ef653ac475c56d703d8df65763976ba6337283272c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7310 10116 bytes
font_02_sfnt_off0000952b.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x952B 4324 bytes

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