Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77f04b0cfa87826…

MALICIOUS

PDF

52.3 KB Created: 2020-08-12 17:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e38ab7fa6f57d077c696ca2de03a53cd SHA-1: 7f5815c5c7c489f2d286110a30fec441a3530974 SHA-256: a77f04b0cfa878260cf7157c0c943102b634fd40e0286e097ed2a8152ee04fac
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK indicating a link to ttraff.com. This URL is presented within the document body, disguised as academic content related to entrepreneurship. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive link.

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=creativity+and+innovation+in+entrepreneurship+notes+pdf
    • http://files.kimkirch.com/uploads/1/3/0/7/130775827/welobozutudirol-fulunim.pdf
    • http://files.apic.biz/uploads/1/3/0/7/130739674/jamatimin_dixeperedurux.pdf
    • http://files.hudsonteachersassociation.com/uploads/1/3/1/4/131437123/5418802.pdf
    • https://cdn.shopify.com/s/files/1/0432/2272/8866/files/8183067188.pdf
    • https://cdn.shopify.com/s/files/1/0431/2658/7549/files/kepasugakixozomumu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7469/8912/files/ruputinozotevoweneg.pdf
    • https://cdn.shopify.com/s/files/1/0432/6601/5400/files/maxesa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ruxejuvekega.pdf
    • https://cdn.shopify.com/s/files/1/0428/0388/8287/files/shear_force_and_bending_moment_diagram_for_fixed_beam.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2305/files/11969259754.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/takemudokefokuwowem.pdf
    • https://cdn.shopify.com/s/files/1/0429/5580/0739/files/nosokurowokoluzo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/52876055892.pdf
    • https://cdn.shopify.com/s/files/1/0431/1918/1978/files/93627908613.pdf
    • https://cdn.shopify.com/s/files/1/0438/8637/9160/files/tonejanakexamiguxem.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_off0000801f.bin
a2cfe31bb8bf5481cbf1afc79fa95f17604b8913679fdd14d89e376b03434772		 pdf-font-stream PDF embedded font (sfnt) at offset 0x801F 5164 bytes
font_01_sfnt_off000091ad.bin
4412c5675102136d7ea12320619bad27eb4547abbe4ed6de0b71d758b4680edf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91AD 10548 bytes
font_02_sfnt_off0000b57b.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB57B 4324 bytes

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