Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce23c2c245340ec…

MALICIOUS

PDF

50.9 KB Created: 2020-08-10 10:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f22bd3971cb8d1183175a306e102719 SHA-1: 252b883404a25f7f7aa73773cb6d475a3d29a640 SHA-256: 7ce23c2c245340ec9cc977e6db77bb8432880b116dd5e0532c3d3a410bc05567
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body, though partially corrupted, includes the URL 'https://ttraff.com/pify?keyword=articles+with+geographical+names+exercises+pdf', suggesting a lure to external, potentially malicious, resources. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=articles+with+geographical+names+exercises+pdf
    • http://files.mainemaritimeministry.org/uploads/1/3/0/7/130774979/a0b25a72f17e60.pdf
    • http://files.fullmoonhealingarts.com/uploads/1/3/0/8/130813714/fdbacbf.pdf
    • http://files.hurstgreenshires.com/uploads/1/3/0/8/130873839/6812142.pdf
    • http://files.gatekeepers7.com/uploads/1/3/2/6/132695569/jorigufewoki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/2603/9452/files/98320157817.pdf
    • https://cdn.shopify.com/s/files/1/0433/8073/6156/files/python_exclusive_or.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/xejibafe.pdf
    • https://cdn.shopify.com/s/files/1/0433/8394/7414/files/bozujunafazenizibewi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2072/1055/files/gowati.pdf
    • https://cdn.shopify.com/s/files/1/0436/5221/9030/files/base64_to_image_js.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/88179579702.pdf
    • https://cdn.shopify.com/s/files/1/0429/7005/4805/files/90360592524.pdf
    • https://cdn.shopify.com/s/files/1/0431/1960/7962/files/reduce_size_mac_2020.pdf
    • https://cdn.shopify.com/s/files/1/0438/0357/4434/files/ethical_hacking_certification_book.pdf
    • https://cdn.shopify.com/s/files/1/0440/2266/1278/files/dmv_ca_release_of_liability.pdf
    • https://cdn.shopify.com/s/files/1/0455/6003/7541/files/fhp_synchronous_motor.pdf
    • https://cdn.shopify.com/s/files/1/0438/0003/5485/files/79449486074.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a52.bin
f42d73002f16c5813df051dfa232c7dfdee8dd9f5988d0032a6f7b0bec64f189		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A52 5504 bytes
font_01_sfnt_off00008ced.bin
9cda0eee4db68eeb779c695a281b390f6d241c5d32e7134b97bbe5b0bb0bbc44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CED 10224 bytes
font_02_sfnt_off0000afeb.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEB 4324 bytes

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