Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b2b4a0ac8da411…

MALICIOUS

PDF

50.4 KB Created: 2020-08-26 02:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d257283fc3938e15e91c5306133989e7 SHA-1: f745590cb2324c1298d0b9ca0bee0c01a0760c9b SHA-256: 09b2b4a0ac8da411e2327034d6aecfd5a033f3d1603ed2cce117b33a0df3040b
154 Risk Score

Malware Insights

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

The PDF contains a high density of embedded links, with the primary URL pointing to a known malicious redirector. The document body, though partially corrupted, includes the malicious URL and appears to be a lure for SEO manipulation or link farming. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests an attempt to direct users to harmful sites.

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.club/pify?keyword=como+colocar+escada+na+diagonal+n%25C3%25A3o
    • http://files.wbfi.org/uploads/1/3/1/6/131636677/mijulivalup_zugadomunalana.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/3651/7286/files/monowijakebotedi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3773/6608/files/kukiru.pdf
    • https://cdn.shopify.com/s/files/1/0433/8493/0462/files/34508886906.pdf
    • https://cdn.shopify.com/s/files/1/0431/8255/5300/files/kavarugibamefedupubimeni.pdf
    • https://cdn.shopify.com/s/files/1/0434/0213/3656/files/91230539085.pdf
    • https://cdn.shopify.com/s/files/1/0431/7121/7565/files/kenmore_elite_dishwasher_reset.pdf
    • https://cdn.shopify.com/s/files/1/0436/0624/5534/files/sujesolanulo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4356/8278/files/diabetic_snack_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0437/7221/5448/files/14834732203.pdf
    • https://cdn.shopify.com/s/files/1/0433/3495/9256/files/69786556402.pdf
    • https://cdn.shopify.com/s/files/1/0432/5031/9528/files/subekivejog.pdf
    • https://cdn.shopify.com/s/files/1/0431/3959/6454/files/73154910649.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bf4.bin
0611911aa8302dcdd11c092418719f023fa7381d9058c44ac5bb4bb695cda7b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF4 5308 bytes
font_01_sfnt_off00007d33.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D33 1800 bytes
font_02_sfnt_off000085c1.bin
d4eba7c1dd57d35b976e5ce1150d09d12a75c3c12192903e93ed62fd0a8bf4b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85C1 12404 bytes
font_03_sfnt_off0000abaa.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABAA 4324 bytes

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