Malicious PDF — malware analysis report

Static analysis result for SHA-256 93402267e2aec643…

MALICIOUS

PDF

49.7 KB Created: 2020-09-01 10:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7c5a40260bc0833b10a9c6be0bc428f SHA-1: abcf65caff7e8b1fe68fed99258c3b49612dd355 SHA-256: 93402267e2aec643f44e96287cb57f3307d25261f0b8aee1011f9ea33dd4c118
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, disguised as documentary answers, redirects to a known malicious domain (ttraff.cc). The document body, though heavily obfuscated, contains this lure text and the malicious URL. The presence of a PDF link farm heuristic further indicates malicious intent to distribute links. The ML classifier strongly flagged this PDF as malicious.

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.cc/wix?keyword=inside+job+documentary+question+answers
    • https://cdn.shopify.com/s/files/1/0437/0061/7381/files/92338340707.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/kudigirasezazesagusiwig.pdf
    • https://cdn.shopify.com/s/files/1/0431/2373/6725/files/ranujitebafusafadesewu.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/manifesto_pakatan_harapan_johor_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0437/7129/7943/files/go_formative_answer_key.pdf
    • https://static.usrfiles.com/ugd/f515ca_397e962d233d4344a1522fc18e41499b.pdf
    • https://static.usrfiles.com/ugd/3e9e83_127a672fa64b4705a7c8143e4c6d3d27.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ebc31fccf7147f5b53ae8a6e3b817d9.pdf
    • https://static.usrfiles.com/ugd/0a0016_facef881265948839b067ca1db182d75.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fb4484087e64ace9d7fdfd0b98e83e3.pdf
    • https://static.usrfiles.com/ugd/a58b01_7bdd4e0b379e40d7a3431e671a392b5b.pdf
    • https://static.usrfiles.com/ugd/2074c9_501533cfdedf4deab99ef0463947ee0f.pdf
    • https://static.usrfiles.com/ugd/bb13a2_c9b0f79e18394857a45f0d4c4c681f8e.pdf
    • https://cdn.shopify.com/s/files/1/0430/3699/9831/files/jitijibapobagedejumebula.pdf
    • https://cdn.shopify.com/s/files/1/0434/3103/5047/files/cell_structure_and_function_test_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0430/5453/0709/files/xoviwuziw.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_off000081a1.bin
358da70d038e1797129677605aef14119dee4dfe1f6f13190267b565d72e8daf
pdf-font-stream PDF embedded font (sfnt) at offset 0x81A1 5524 bytes
font_01_sfnt_off00009463.bin
40cadbc9f2549f25ae3141029a4cb885281c24a5c7a19f9a7c662a69492fa70b
pdf-font-stream PDF embedded font (sfnt) at offset 0x9463 10956 bytes