Malicious PDF — malware analysis report

Static analysis result for SHA-256 8edcbcc1de7bb305…

MALICIOUS

PDF

76.0 KB Created: 2020-08-05 04:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e61185b34299e56e522b0cbf7e60ee8 SHA-1: 7a454e4400f6265eee20641fe48414ea23a7f742 SHA-256: 8edcbcc1de7bb305b79107a1a951199b3c82758bc46f2812319dd214d4ed025e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a link farm. The embedded URL 'https://ttraff.cc/pify?keyword=historia+del+cristianismo+primitivo+pdf' is a known malicious redirector. The document also contains a large number of links pointing to Shopify domains, likely as part of an SEO manipulation or link farm strategy to obscure the malicious intent. The ML classifier strongly supports the malicious verdict.

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=historia+del+cristianismo+primitivo+pdf
    • http://jeberipib.environmentallaw-teach.org/uploads/1/3/0/7/130738714/woniwuj.pdf
    • http://files.jlsvalves.com/uploads/1/3/1/3/131380107/sopixawoxisaxabowegi.pdf
    • http://files.karolos.org/uploads/1/3/1/6/131637606/1438136.pdf
    • http://files.annamckerrow.com/uploads/1/3/0/8/130814157/3a55a2b.pdf
    • https://cdn.shopify.com/s/files/1/0430/3867/1010/files/6202208429.pdf
    • https://cdn.shopify.com/s/files/1/0437/0992/3493/files/adult_ov_guide.pdf
    • https://cdn.shopify.com/s/files/1/0438/8470/7992/files/laxegenodobej.pdf
    • https://cdn.shopify.com/s/files/1/0432/2715/2539/files/27200972735.pdf
    • https://cdn.shopify.com/s/files/1/0434/3237/8517/files/vobuwavipumojuwe.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3399/files/tuzekipodomoterelutukezut.pdf
    • https://cdn.shopify.com/s/files/1/0431/7616/5536/files/tufolawotofekosexomar.pdf
    • https://cdn.shopify.com/s/files/1/0435/2727/4645/files/assistant_engineer_computer_science_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0435/4365/8650/files/47791165212.pdf
    • https://cdn.shopify.com/s/files/1/0437/6123/8168/files/legosadupi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7317/4680/files/77376978692.pdf
    • https://cdn.shopify.com/s/files/1/0435/3874/3450/files/53630852250.pdf
    • https://cdn.shopify.com/s/files/1/0433/6248/4383/files/workplace_bullying_policy.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e507.bin
c20fcec7e85325498a3b6d3b147d7be8a8ae1348a4550e594fe57a0f1c7a253f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE507 5324 bytes
font_01_sfnt_off0000f711.bin
eea83e1d5975b7cabc15962dad6ddd45a4a781f017282d13d87083f5cd47ebc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF711 13372 bytes

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