Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea37bf07be6cce8…

MALICIOUS

PDF

45.9 KB Created: 2020-08-24 09:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b337105072a35368d31e90d5f943280 SHA-1: d64e619848f817533a7a635c20a08e835dad59ad SHA-256: 7ea37bf07be6cce85f58c074af13e208c84b86924ff7347a1a5b0c13af239e7e
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high ML score and the presence of a link to known malicious redirector infrastructure. The document also contains a large number of embedded links, many pointing to external PDF files, suggesting a link farm or SEO manipulation tactic. While no scripts were extracted, the embedded links are the primary indicators of malicious intent, likely serving as a lure or a distribution mechanism for further payloads.

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/pify?keyword=manual+ip+address+in+linux
    • http://files.jennifermariehealingarts.com/uploads/1/3/1/0/131070972/bugadekototiwut.pdf
    • http://dolivab.michigandancecompany.com/uploads/1/3/0/7/130775373/ec78f7e29.pdf
    • http://kuvom.edenlankaholidaytours.com/uploads/1/3/1/4/131454269/8291390.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6192/7318/files/foparesonedewijawenuna.pdf
    • https://cdn.shopify.com/s/files/1/0429/3738/5123/files/13802227692.pdf
    • https://cdn.shopify.com/s/files/1/0435/8940/2783/files/bpsc_pt_exam_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0435/9094/2888/files/teflon_don_zip.pdf
    • https://cdn.shopify.com/s/files/1/0454/3532/2526/files/togefuzazulonujutuzetuneb.pdf
    • https://cdn.shopify.com/s/files/1/0431/9952/9120/files/chart_full_international_phonetic_alphabet.pdf
    • https://cdn.shopify.com/s/files/1/0432/8793/7179/files/pidubiverogane.pdf
    • https://cdn.shopify.com/s/files/1/0430/8064/6807/files/zebosatifaliwapojabonoxud.pdf
    • https://cdn.shopify.com/s/files/1/0430/1642/1529/files/jobovijafujutemexibex.pdf
    • https://cdn.shopify.com/s/files/1/0429/5986/3959/files/87256679510.pdf
    • https://cdn.shopify.com/s/files/1/0438/1691/1010/files/angular_2_local_variable_in_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/4902/5690/files/marvel_deadpool_comics_free_download.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_off000072bb.bin
40772b113c0444b440437abd16207287587508a3e360504c27ce985ad9534751		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72BB 5024 bytes
font_01_sfnt_off000083e1.bin
cfef02c4439c7744bb8b52ec080ff5b1d512e75c7c4c9cdcf86023bb43234781		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83E1 12088 bytes

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