Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1aa3722da939103…

MALICIOUS

PDF

39.4 KB Created: 2020-08-18 14:40:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7120979504ab6e72315f3da3174acd4 SHA-1: 1991618f5dcc03f00aaa0ffaf2f57f98ae98578b SHA-256: d1aa3722da93910325c815d71fea0563a1b3d71befb16331ecbef1cd3ae2671c
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'word questionnaire template' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

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=word+questionnaire+template+2010
    • http://files.bcfca.org/uploads/1/3/1/6/131607043/1688049.pdf
    • https://cdn.shopify.com/s/files/1/0429/9948/0473/files/24801835621.pdf
    • https://cdn.shopify.com/s/files/1/0430/9244/3303/files/duxebafemobijinikowomar.pdf
    • https://cdn.shopify.com/s/files/1/0438/6154/1014/files/shoulder_impingement_syndrome_physiotherapy.pdf
    • https://cdn.shopify.com/s/files/1/0433/2729/1544/files/dusupoda.pdf
    • https://cdn.shopify.com/s/files/1/0435/6472/8483/files/surevinokedarubujesimerif.pdf
    • https://cdn.shopify.com/s/files/1/0431/9887/3762/files/45905444761.pdf
    • https://cdn.shopify.com/s/files/1/0434/1281/6026/files/71631137991.pdf
    • https://cdn.shopify.com/s/files/1/0434/7386/2821/files/35545969520.pdf
    • https://cdn.shopify.com/s/files/1/0431/9074/7295/files/71764798586.pdf
    • https://cdn.shopify.com/s/files/1/0433/3237/0584/files/ultimate_reset_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0431/4352/8609/files/jafivusom.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/xojuwabobuwap.pdf
    • https://cdn.shopify.com/s/files/1/0432/0228/1633/files/numbers_1-_100_in_words_worksheet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c40.bin
b3bfeebb6f4829993e8f98f871470efb679e72f358d2aeec811f71d69ed929f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C40 5568 bytes
font_01_sfnt_off00006f31.bin
44e1b048bc3a03c757bd4cc18de7491f36618e28aed58803f81449b6aa9fbe9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F31 9908 bytes