Malicious PDF — malware analysis report

Static analysis result for SHA-256 d255b54f5e118c88…

MALICIOUS

PDF

37.8 KB Created: 2020-07-14 21:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3564eb192ea3cfdda4eb54aa6e6ce9c2 SHA-1: fa7cd75be88f40e0dcac53c5e040a76440ba6a7e SHA-256: d255b54f5e118c88a615bb9a4afbcf87558dd5f5db104a486ff6a787c2e352f7
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to benign-looking WordPress PDF files, but one critical link directs to a known malicious redirector at ttraff.com. This suggests a link farm or SEO poisoning tactic to lure victims. The document body, though heavily obfuscated, contains text related to educational worksheets, which is likely a lure to disguise the malicious intent. No scripts were extracted, but the presence of the malicious redirector is a strong indicator of a phishing or malware delivery 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.com/wb?keyword=area%20of%20triangles%20and%20quadrilaterals%20worksheet%20tes
    • http://files.commoditieslawyers.com/uploads/1/3/1/1/131163747/1118161.pdf
    • http://files.srrlsf.com/uploads/1/3/1/8/131871499/1149571.pdf
    • http://files.bearlakeregionalcommission.org/uploads/1/3/0/7/130740180/takamobiju.pdf
    • https://zokuwin.files.wordpress.com/2020/06/82220940963.pdf
    • https://roberodefon.files.wordpress.com/2020/07/sararufakowep.pdf
    • https://notavudaja.files.wordpress.com/2020/06/wawezugupokukawowogidi.pdf
    • https://boraburegoda.files.wordpress.com/2020/07/tezematimojeg.pdf
    • https://naxopovo.files.wordpress.com/2020/06/xatitaxiza.pdf
    • https://bavorekivaso.files.wordpress.com/2020/07/89282832607.pdf
    • https://nutumomox.files.wordpress.com/2020/06/zodebutaruxavuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kenawuvotijogajutimev.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56966684837.pdf
    • https://cdn.shopify.com/s/files/1/0431/1557/7504/files/pijuwujifimeni.pdf
    • https://cdn.shopify.com/s/files/1/0435/1868/9432/files/5836507919.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/gemumanazetulaxeruv.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/92083332601.pdf
    • https://cdn.shopify.com/s/files/1/0427/8992/9116/files/91494134046.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/liwobexafula.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/
    • https://notavudaja.files.wordpress.com/2020/06/wawezugupokukawowo

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005787.bin
b926b71a0e614ba714d88514f895eef2281a128bb54151b5280a0ad1aa57c0f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5787 5324 bytes
font_01_sfnt_off0000699a.bin
0429c59d849d27cc60bdf5b544b9a4c235eed1728c10bb4e459d5047fc36f36a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x699A 9884 bytes

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