Malicious PDF — malware analysis report

Static analysis result for SHA-256 413c13ff816b4bf4…

MALICIOUS

PDF

36.1 KB Created: 2020-08-25 05:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4bbff70b18c8aac4f3f525479af6e90 SHA-1: 0416937688492d8e54991583d3e1ff19467085b3 SHA-256: 413c13ff816b4bf4dc991ace4590aa84ef4eda17c7dd9be876d4975b53404aa1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass of external links, many pointing to suspicious domains, and one specific link to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a medical textbook, likely a lure to encourage clicks on the malicious URLs. The ML classifier strongly indicated maliciousness, and the PDF structure itself is flagged for containing a large number of external links, consistent with a link farm or phishing attempt.

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=langman%2527+s+medical+embryology+pdf
    • http://kupuz.procasinoparties.com/uploads/1/3/0/8/130874493/68eb2c0670d.pdf
    • http://files.kenaigold.com/uploads/1/3/1/6/131606546/jetofegasoju_gufadafewixib_pojejovare.pdf
    • http://taxes.n3vem.com/uploads/1/3/0/8/130813059/tovezolegi.pdf
    • http://files.roppen.com/uploads/1/3/0/7/130738812/falofob_gamaje_gutasizewujasi_sekofaf.pdf
    • http://kuxivakev.upcreekmarket.com/uploads/1/3/0/9/130969723/dimajodudufamuridab.pdf
    • https://cdn.shopify.com/s/files/1/0430/7743/5556/files/17516400887.pdf
    • https://cdn.shopify.com/s/files/1/0437/7224/8222/files/deadpool_psp_game_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0440/6027/8936/files/jemotosiva.pdf
    • https://cdn.shopify.com/s/files/1/0432/6712/9504/files/uidai_update_form.pdf
    • https://cdn.shopify.com/s/files/1/0435/5611/0495/files/anycast_dongle_setup_android.pdf
    • https://cdn.shopify.com/s/files/1/0447/9270/9271/files/73493458153.pdf
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/xufezu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8582/4164/files/rozexupisolefupolumo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0933/4696/files/nadisapodapalojorukemiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/3095/4655/files/badime.pdf
    • https://cdn.shopify.com/s/files/1/0430/6803/1143/files/ammyy_admin_software.pdf
    • https://cdn.shopify.com/s/files/1/0433/1867/3566/files/logical_connectors_exercises.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_off00004edf.bin
cf27ee411c5c879ad12254ddf25e50ba4d22e991dfed1ea8a2b26ffb7bfc4981		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EDF 5692 bytes
font_01_sfnt_off0000622c.bin
57f737169dbeea97237b270721ffcb77d86f797e6218d49e0bcec4fc783b3729		 pdf-font-stream PDF embedded font (sfnt) at offset 0x622C 9744 bytes

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