Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c9df95ad892139…

MALICIOUS

PDF

41.2 KB Created: 2020-07-29 15:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6b98ddc0e96027dcaede2fdf2f8445c SHA-1: d1884f2f92f766c032820be2512a0a9f82ad50ff SHA-256: c9c9df95ad892139df84b57473cbd29bbd52ddae33eb28ab65502a53210a18c4
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, which are likely part of an SEO link farm to disguise malicious redirects. The primary redirector URL, 'https://ttraff.cc/pify?keyword=estrategias+docentes+para+un+aprendizaje+significativo+pdf+libro', is flagged as malicious. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure and link farm indicate a social engineering attempt to lure users to malicious sites.

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=estrategias+docentes+para+un+aprendizaje+significativo+pdf+libro
    • http://files.rigorrelevanceandrelationships.com/uploads/1/3/1/6/131606198/8377340.pdf
    • http://files.penndmc.org/uploads/1/3/1/8/131860938/e9e88e61167ff.pdf
    • http://files.fnmiec.ca/uploads/1/3/0/9/130969710/7682567.pdf
    • http://files.rosamiliafornjea.org/uploads/1/3/1/3/131381046/eae383ab76ad.pdf
    • http://files.danspurearts.com/uploads/1/3/1/3/131380467/kabidadosamufix.pdf
    • http://files.rigorrelevanceandrelationships.com/uploads/1/3/1/6/1316061
    • https://cdn.shopify.com/s/files/1/0437/3449/9493/files/letekazavikopoxof.pdf
    • https://cdn.shopify.com/s/files/1/0437/1241/3851/files/63394131617.pdf
    • https://cdn.shopify.com/s/files/1/0438/1209/4109/files/pigezadobetutuxojiwepolef.pdf
    • https://cdn.shopify.com/s/files/1/0433/4996/6998/files/sitedujobofapagunejosozi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5272/0543/files/92166972719.pdf
    • https://cdn.shopify.com/s/files/1/0428/9868/6111/files/44909331065.pdf
    • https://cdn.shopify.com/s/files/1/0430/0383/8615/files/dubotelagatuju.pdf
    • https://cdn.shopify.com/s/files/1/0428/1224/4134/files/gumepinuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/4293/8784/files/poxugaxamilifemukibewi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3053/6614/files/pikafuxulavafe.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_off00005f28.bin
163f7fc46132e39f15a04388085f8d521d0633a602623fb876f0bfdc51fbcd8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F28 5488 bytes
font_01_sfnt_off000071e9.bin
749e96f16c1b4d6c62ee6ccc3d277ec2da2554422a77096c0c6e1fe736eb9ed8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71E9 10756 bytes

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