Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc2f24a67de6a54…

MALICIOUS

PDF

39.2 KB Created: 2020-08-05 07:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 371a1afe1d5ec37ef823ed398dcec9b6 SHA-1: 7f7ed2d8d1e7d513b5c04dd2829015610a6a7c44 SHA-256: 1cc2f24a67de6a54d97f16354f439c88fc8371528940567b0be3f9bc9a985a6d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting a tactic to manipulate search results or distribute malicious content. The ML classifier strongly supports the malicious verdict. No scripts were extracted from this sample.

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=1500+color+mixing+recipes+for+oil+acrylic+watercolor+pdf
    • http://files.soulsoflifesociety.org/uploads/1/3/0/7/130739163/nuxagafepakep.pdf
    • http://bisuxulal.friendsofthetalkeetnalibrary.org/uploads/1/3/2/6/132682646/5fe0da7.pdf
    • http://files.moveaheadwithkelly.com/uploads/1/3/1/8/131872079/4701083.pdf
    • http://files.samahanfilamheritage.org/uploads/1/3/2/6/132681153/7286031.pdf
    • http://files.daphnefatterphd.com/uploads/1/3/0/7/130775306/motalale.pdf
    • https://cdn.shopify.com/s/files/1/0430/0288/8351/files/79499553398.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8385/files/30785190308.pdf
    • https://cdn.shopify.com/s/files/1/0428/7099/7151/files/23647469030.pdf
    • https://cdn.shopify.com/s/files/1/0435/7881/8715/files/gta_v_emblems.pdf
    • https://cdn.shopify.com/s/files/1/0433/4691/9579/files/acoustic_guitar_chords_lessons.pdf
    • https://cdn.shopify.com/s/files/1/0451/0354/6533/files/cuando_se_cae_el_cordon_umbilical.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69440205977.pdf
    • https://cdn.shopify.com/s/files/1/0432/8862/5316/files/46995765212.pdf
    • https://cdn.shopify.com/s/files/1/0433/3964/5093/files/wenefawud.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6651/files/zibolijulotinagatumudone.pdf
    • https://cdn.shopify.com/s/files/1/0430/0960/5791/files/munna_bhai_mbbs_full_movie.pdf
    • https://cdn.shopify.com/s/files/1/0433/3276/3801/files/84309140277.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000049ab.bin
c669eab1c3706a698ffc02a8c63ae173f7b8eb410f170ce1e0832bdb090b0c28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49AB 5748 bytes
font_01_sfnt_off00005d38.bin
48a209bc1921b264a07b625c67530abdf8cb5d225e56e6fe207e46b55d8e71ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D38 10012 bytes
font_02_sfnt_off00007f56.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F56 4324 bytes

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