Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db2102dbfa41c6c…

MALICIOUS

PDF

52.0 KB Created: 2020-09-22 21:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e83f1f1e3bfd037608fd25e56dd39f88 SHA-1: 2729c2932c4c7fa763c6953ffa41f61bc6ea575a SHA-256: 3db2102dbfa41c6c6b32f367e1fe081dca61e2471b4b005b254e74b1a6f4d169
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is further supported by a PDF link farm heuristic. The embedded document body, though heavily obfuscated, contains URLs that are also flagged as malicious redirectors. These elements strongly indicate an attempt to direct the user to malicious infrastructure, likely for phishing or malware delivery.

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.link/wix?keyword=olympus+om-4+repair+manual
    • http://kumojun.gregwhite76.com/uploads/1/3/2/6/132695663/3200989.pdf
    • http://zetolijar.freewheelspa.com/uploads/1/3/0/8/130874488/gerufonogiz.pdf
    • http://files.spiritualitycircle.com/uploads/1/3/1/4/131407183/8ebdc77222f8e.pdf
    • http://files.plekhanoff.com/uploads/1/3/0/7/130775046/5791368.pdf
    • http://gasenox.merakiimeasure.com/uploads/1/3/2/6/132681411/xaravoket.pdf
    • https://cdn.shopify.com/s/files/1/0435/4369/1413/files/modern_periodic_table_notes.pdf
    • https://cdn.shopify.com/s/files/1/0434/5865/8469/files/sebuni.pdf
    • https://0b941bd6-2398-486b-9b77-54a5e4059313.filesusr.com/ugd/3225da_31766cac1d5f442db65a2c226b027a41.pdf?index=true
    • https://a00aadb2-679e-41fe-9a03-b7c8c6342e63.filesusr.com/ugd/76aeb6_02378d39445147c1aff363d3d422cfe2.pdf?index=true
    • 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_off000080a0.bin
57b7d5dd0cd898aed22227134b0b99e695426edd86cae5241deddf95828c392a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80A0 5016 bytes
font_01_sfnt_off0000919d.bin
77dc98007a084313e6a64c3e80b2047527910deaa15c3bf44f12e58fae0dd2c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x919D 10396 bytes
font_02_sfnt_off0000b533.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB533 4324 bytes

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