Malicious PDF — malware analysis report

Static analysis result for SHA-256 09200bbf6f0f7f75…

MALICIOUS

PDF

46.4 KB Created: 2020-08-08 09:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3cbf31cea1c011b100720b754b0acd1a SHA-1: 9277e12be6884b34b28fc335bfef783a2c072a6c SHA-256: 09200bbf6f0f7f75837ad9c2613221da9c9221073ca9148d79bc435267eb817e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though partially corrupted, includes the string 'Oci application form pdf malaysia' and a URL that appears to be part of a link farm designed to manipulate search engine results. The presence of numerous Shopify-hosted PDFs suggests an attempt to blend malicious links with seemingly benign content, likely to distribute malware or conduct phishing. No scripts were extracted, but the primary attack vector appears to be the malicious links embedded within the document.

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=oci+application+form+pdf+malaysia
    • http://files.sparrowhillinn.com/uploads/1/3/1/4/131408572/lubuler_nigilivuzilep_zilolowove_ruwinijejigadas.pdf
    • http://files.kerrysiggins.com/uploads/1/3/0/8/130874090/kadiwazurixu-dofiluziwojizer-ninekexi.pdf
    • http://files.mikemythphotography.com/uploads/1/3/0/7/130739457/sawisovefipi.pdf
    • http://files.thetimebetweenis.org/uploads/1/3/2/6/132696113/lepot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0306/0128/files/8th_grade_math_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0430/6809/6661/files/44801906245.pdf
    • https://cdn.shopify.com/s/files/1/0434/5793/7561/files/regudusa.pdf
    • https://cdn.shopify.com/s/files/1/0433/3702/3641/files/john_deere_185_hydro.pdf
    • https://cdn.shopify.com/s/files/1/0428/9685/1103/files/vijawepipuwetunawewa.pdf
    • https://cdn.shopify.com/s/files/1/0428/6277/2380/files/61406899127.pdf
    • https://cdn.shopify.com/s/files/1/0438/4151/9776/files/acft_workout_plan.pdf
    • https://cdn.shopify.com/s/files/1/0431/6423/7992/files/xenevuvevako.pdf
    • https://cdn.shopify.com/s/files/1/0437/2329/2822/files/51748572194.pdf
    • https://cdn.shopify.com/s/files/1/0440/0077/2246/files/29169350703.pdf
    • https://cdn.shopify.com/s/files/1/0434/8100/6244/files/anterior_triangle_of_the_neck.pdf
    • https://cdn.shopify.com/s/files/1/0428/6981/7511/files/57596442540.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c5c.bin
06fdce07efa02b0bbc98a783251d6aa13c078a2956a945ea859898052e17d7eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C5C 5432 bytes
font_01_sfnt_off00007ec8.bin
cefab0887253678d5707c426614a4d8f5df6b4dfb7e062a39fcae16cddffd1c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC8 14352 bytes

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