Malicious PDF — malware analysis report

Static analysis result for SHA-256 a20c2a8d0858b7b1…

MALICIOUS

PDF

49.6 KB Created: 2020-08-09 08:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fe0defa724a4adc170b650a71c25a73 SHA-1: 9830b6e262dbf1b23f24dfad6efe34e96d025da5 SHA-256: a20c2a8d0858b7b157b0e0191b2734d616501a18f5b1342a3d143546f675c575
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary malicious redirector URL embedded in the document body. The ML classifier strongly indicates maliciousness. The primary malicious URL is https://ttraff.com/pify?keyword=understanding+evidence+based+public+health+policy+pdf, which likely leads to further malicious content or phishing attempts.

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=understanding+evidence+based+public+health+policy+pdf
    • http://files.tonibeutler.com/uploads/1/3/1/8/131871854/3651723.pdf
    • http://files.evolutioned.org/uploads/1/3/1/3/131384208/folavune-jerarozisu-golofavoxite.pdf
    • http://files.apaacupuncture.com/uploads/1/3/2/7/132710497/munifako-gunopoxuwemopu-zalelibida-wediluvisa.pdf
    • http://files.newellbooks.com/uploads/1/3/0/8/130813797/vapujulo_rajeker_vewidufe.pdf
    • http://files.worcesterdoula.com/uploads/1/3/1/1/131163914/2967576.pdf
    • https://cdn.shopify.com/s/files/1/0438/3516/2786/files/60040200469.pdf
    • https://cdn.shopify.com/s/files/1/0431/4329/9228/files/96794295207.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7291/files/37775716219.pdf
    • https://cdn.shopify.com/s/files/1/0430/8035/1897/files/7065211092.pdf
    • https://cdn.shopify.com/s/files/1/0431/0073/3596/files/67542003314.pdf
    • https://cdn.shopify.com/s/files/1/0433/3993/9994/files/78324230543.pdf
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/ruwulebudagimibuva.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pamuzinesikajojefex.pdf
    • https://cdn.shopify.com/s/files/1/0432/1034/2564/files/ginirajasutoruxozobate.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/wikek.pdf
    • https://cdn.shopify.com/s/files/1/0448/2488/7456/files/archachatina_marginata.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_off000082c5.bin
d4969afec4ac9b4b78fed82a73a0e15425c0df763b83a66c32a67933ffd02704
pdf-font-stream PDF embedded font (sfnt) at offset 0x82C5 5708 bytes
font_01_sfnt_off00009636.bin
719a1d59d043cdd1d2627f4dadbc82594ff2508d43a24d9e9c81ae54c404700b
pdf-font-stream PDF embedded font (sfnt) at offset 0x9636 10164 bytes