Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8f42aff7830e97…

MALICIOUS

PDF

39.8 KB Created: 2020-08-16 00:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ea3869a68c0684f09e0b482c77aa84c SHA-1: 0ed98a2abd8dd2c9692c01ed70071377f707a616 SHA-256: 8f8f42aff7830e97271a2ecbada006441ea79a9588b2464e55c1679632a3a9b5
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL disguised as interview preparation material. The primary malicious URL, https://ttraff.cc/wb?keyword=hiring%20manager%20interview%20questions%20and%20answers%20pdf, is designed to redirect the user to further malicious content. The presence of numerous embedded links, many pointing to benign Shopify domains but also including a suspicious PDF hosted on 'monsteravisual.com', indicates a coordinated effort to distribute 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.cc/wb?keyword=hiring%20manager%20interview%20questions%20and%20answers%20pdf
    • http://totejogu.monsteravisual.com/uploads/1/3/1/0/131070374/jisupepuma-woritixidujita-kejejuzenafiwek.pdf
    • https://cdn.shopify.com/s/files/1/0437/2594/7029/files/79669938246.pdf
    • https://cdn.shopify.com/s/files/1/0436/5710/1465/files/david_goggins_book_can_t_hurt_me.pdf
    • https://cdn.shopify.com/s/files/1/0438/2982/1600/files/43830709347.pdf
    • https://cdn.shopify.com/s/files/1/0431/6214/0840/files/android_sqlite_database_example_source_code.pdf
    • https://cdn.shopify.com/s/files/1/0431/7236/4445/files/dutilutazitavufipetaxin.pdf
    • https://cdn.shopify.com/s/files/1/0432/5523/4710/files/33789205471.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38659434623.pdf
    • https://cdn.shopify.com/s/files/1/0434/5928/1061/files/abnormal_human_karyotype.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_off00005df4.bin
4eaf8c675335f085296569199bd981ea50fe39947b1c29cd6b015cb103f97e64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF4 5568 bytes
font_01_sfnt_off000070cd.bin
bdaa797d0ca84e639dc0dd0bb426e92f93d8c420e1560b906962acbd473c2e37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70CD 9936 bytes

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