Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f29b344a38c6da7…

MALICIOUS

PDF

40.5 KB Created: 2020-08-23 15:40:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53805029f055b448b766dfd924395f0c SHA-1: b01f7a9e5cb0e62f6711dc15953526836ee5b108 SHA-256: 5f29b344a38c6da775067482c690d3a008cdcdfd59294ddaae974e1446d1cae6
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 pointing to external PDF files, indicating a link farm or SEO spam campaign. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.ru/pify?keyword=animal+crossing+new+leaf+rover+face+guide`. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, likely initiated via spearphishing.

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=animal+crossing+new+leaf+rover+face+guide
    • http://files.swazisafe.org/uploads/1/3/1/4/131453022/denuwat.pdf
    • http://netilox.theredroomproject.com/uploads/1/3/0/7/130775350/kaviju.pdf
    • http://files.essenceofbeautydublin.com/uploads/1/3/1/6/131637057/9362341.pdf
    • http://files.careerlinkhighschool.org/uploads/1/3/0/7/130776578/bijapemopebujo.pdf
    • http://xefuler.nkp.rocks/uploads/1/3/0/8/130873952/b228ffc043ef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6583/4649/files/clubbers_guide_ibiza_2008.pdf
    • https://cdn.shopify.com/s/files/1/0465/5421/8646/files/97509292476.pdf
    • https://cdn.shopify.com/s/files/1/0430/4414/3253/files/98689104750.pdf
    • https://cdn.shopify.com/s/files/1/0431/3425/5266/files/81408340795.pdf
    • https://cdn.shopify.com/s/files/1/0430/2520/3354/files/dafexawopilade.pdf
    • https://cdn.shopify.com/s/files/1/0427/4244/8295/files/representation_theory_of_lie_groups.pdf
    • https://cdn.shopify.com/s/files/1/0431/0453/4692/files/whatsapp_apk_for_iphone_5c.pdf
    • https://cdn.shopify.com/s/files/1/0430/9159/1317/files/emerald_tablets_of_thoth_deutsch.pdf
    • https://cdn.shopify.com/s/files/1/0462/5793/0394/files/30222356143.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9461/files/kojejikozijosazifewol.pdf
    • https://cdn.shopify.com/s/files/1/0459/6210/0896/files/correct_punctuation_in_sentences_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/0549/9801/files/dafobiterasodanokagosi.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_off00005f9c.bin
39082dafaae7f12255ac0ed36e1cff7feb4a4b568b87978a19b4323f653927a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9C 5480 bytes
font_01_sfnt_off0000722c.bin
cc532e34253d5645bfad9fee8533d405a23ddb2bbd153262f1fdc0d09b65e065		 pdf-font-stream PDF embedded font (sfnt) at offset 0x722C 10236 bytes

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