Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ef1f526e9112b0…

MALICIOUS

PDF

41.8 KB Created: 2020-09-12 18:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 445cd11c0e3c262d33d2c7895bb6ebfd SHA-1: 5d71959f053411ca0f90305e642f1ccd4cdd8ef9 SHA-256: 72ef1f526e9112b081aa873f14f800354e664920e35488a199bf4af4544b569b
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which points to a URL that is part of a link farm. The document body, though heavily obfuscated, contains a reference to the same malicious URL. The ML classifier also strongly indicated maliciousness. The presence of numerous links to external PDFs suggests an attempt to obscure the ultimate destination or to distribute further malicious content.

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.link/pify?keyword=st+charles+elementary+school+newport+mi
    • http://gerun.twcnpc.com/uploads/1/3/0/8/130814328/volijaru.pdf
    • http://labazadu.mel-reiki.com/uploads/1/3/1/4/131438873/gaberefupagumur-robimip-burowakute.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/98e298_a649683d7c884f978aeb33db4c1b0852.pdf
    • https://static.usrfiles.com/ugd/72216b_26ec3db4fb3546d4bbba5652b8525687.pdf
    • https://static.usrfiles.com/ugd/9219f8_5e3d18cbb89948e39362bc068e8b823c.pdf
    • https://static.usrfiles.com/ugd/77941b_adeec7fd5e4d4eee95b036d6ce08acec.pdf
    • https://static.usrfiles.com/ugd/fa6f14_2fb4974f915f45d7976d933fe851ae15.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ef64ecb730745fa80d6796dcadb740c.pdf
    • https://static.usrfiles.com/ugd/3e7897_325ca24e66ec4c74b84e8967c44cc8b3.pdf
    • https://static.usrfiles.com/ugd/cfbfd2_07f4e57ef4cc42fd885f8b87f3e2eb09.pdf
    • https://static.usrfiles.com/ugd/a640e9_00019a0d51db40cfa9599a9a6d19101f.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6582/files/99919028920.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/80383309432.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_off0000650a.bin
58d80e45a4bf0938cee9c34d11e04e273227d8f2b3a9a2cf6c9af6c2630d6f2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x650A 5472 bytes
font_01_sfnt_off00007790.bin
ee05db9c2697e2711ce2e8c1cbbe4dce94e57ed0b99ea4d4dba6f415c471279e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7790 10088 bytes