Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b118e30e878df6…

MALICIOUS

PDF

42.0 KB Created: 2020-07-30 16:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6ce9acd1368d6f7d2db5f8d4902d9d9 SHA-1: be16e00de5e898c351c59930d61a88d5bc53ee20 SHA-256: 11b118e30e878df6de6f3aba25e36b531d325dae95665e6e3e3de79ea6cce67c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to academic papers, likely to trick users into visiting malicious sites. 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.cc/pify?keyword=effect+of+water+pollution+on+ecosystem+pdf
    • http://files.temploobaife.com/uploads/1/3/1/4/131438245/lelurebov-nonivopexaf.pdf
    • http://files.phsboosters.org/uploads/1/3/1/4/131437725/masulagem_bumumazulitowe_jaxabuso.pdf
    • http://files.mariebrookephotography.com/uploads/1/3/1/3/131382590/domojiperajeso.pdf
    • http://files.baytutoring.com/uploads/1/3/0/8/130814601/fekomokofi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8595/4208/files/83920918659.pdf
    • https://cdn.shopify.com/s/files/1/0436/7237/1350/files/rizififesikaledavug.pdf
    • https://cdn.shopify.com/s/files/1/0434/0455/8488/files/70761555510.pdf
    • https://cdn.shopify.com/s/files/1/0433/2499/7800/files/nixadubu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9754/7157/files/54792635601.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xibirinadinabamagumib.pdf
    • https://cdn.shopify.com/s/files/1/0428/4124/3814/files/firumudajidekusadopodawaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/5654/6467/files/67203547701.pdf
    • https://cdn.shopify.com/s/files/1/0431/0047/1456/files/7670801345.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/lusedizijiwude.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_off000067e1.bin
c4fad04310a907a20b208c665436dc3c306767a13520c19629213919aeebdec3
pdf-font-stream PDF embedded font (sfnt) at offset 0x67E1 5336 bytes
font_01_sfnt_off000079fd.bin
6bf77c2f9375fa0af8667d82529fe2a18c9d8003705907ce6f718aa59c825a7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x79FD 10192 bytes