Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a28d455e6b1db1…

MALICIOUS

PDF

46.3 KB Created: 2020-08-12 12:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27cc619c8faf873e5c2fbbe024e2965c SHA-1: bdee524b23c5f570d972e28447e4980ba78adef0 SHA-256: 36a28d455e6b1db16e6510af8eaf1143260025d4f21e3787cbd6bb16e9954719
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a 'clerical ability test' lure, which aligns with the malicious redirector URL. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm designed to obscure the ultimate malicious destination.

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=clerical+ability+test+pdf
    • http://files.statesocietyofflorida.org/uploads/1/3/0/9/130969083/0ae1478.pdf
    • http://files.evepinsonnault.com/uploads/1/3/2/6/132681672/jugipujunuxex.pdf
    • http://files.bookofcenturies.com/uploads/1/3/1/1/131163851/sabekuf.pdf
    • https://cdn.shopify.com/s/files/1/0448/1361/5264/files/allen_test_papers_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/josuzafegeda.pdf
    • https://cdn.shopify.com/s/files/1/0427/9051/8940/files/nolegi.pdf
    • https://cdn.shopify.com/s/files/1/0435/6797/2515/files/border_collapse_not_working_in.pdf
    • https://cdn.shopify.com/s/files/1/0437/9734/8514/files/85532510550.pdf
    • https://cdn.shopify.com/s/files/1/0438/7205/9547/files/dusalatemabuwugopetarego.pdf
    • https://cdn.shopify.com/s/files/1/0435/2219/5608/files/shooting_guard_drills.pdf
    • https://cdn.shopify.com/s/files/1/0432/2813/5591/files/25828530925.pdf
    • https://cdn.shopify.com/s/files/1/0429/4112/0679/files/landlord_reference_letter.pdf
    • https://cdn.shopify.com/s/files/1/0430/7684/5728/files/pumijikumexujepinitoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/8709/4177/files/sokaxifavamofuxiwedawu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2574/4547/files/duridor.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/70966022347.pdf
    • https://cdn.shopify.com/s/files/1/0448/1767/8497/files/balanceamento_quimico_passo_a_passo.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_off000067ca.bin
bfe780cc1223292851d19e490e9fc0ec557383c2751ab9e6b86fb3b2c8dac5d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67CA 4988 bytes
font_01_sfnt_off000078cf.bin
4657ae1cf1f0c3e1a6fc68b3d1253cf81632e8ba59ecb6c54f647dc89866f439		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78CF 10416 bytes
font_02_sfnt_off00009c61.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C61 4324 bytes

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