Malicious PDF — malware analysis report

Static analysis result for SHA-256 91beaf3df9faab36…

MALICIOUS

PDF

37.5 KB Created: 2020-08-25 12:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 142b9a01db6ca27aa71e15bae1f9fc6a SHA-1: b2451eedf8a6b4cbe12ce592e087025207d00db3 SHA-256: 91beaf3df9faab36037a0f79a745dbd22845ed078a7ff485342d175368ed3039
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains numerous URLs, including a primary redirector at 'https://ttraff.com/pify?keyword=lagu+abiem+ngesti+bencana' and many links hosted on cdn.shopify.com, suggesting a link distribution or phishing campaign.

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=lagu+abiem+ngesti+bencana
    • http://files.cleath-harris.com/uploads/1/3/1/4/131452989/5787096.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1518/files/74420547350.pdf
    • https://cdn.shopify.com/s/files/1/0434/4256/9383/files/lugovixegoko.pdf
    • https://cdn.shopify.com/s/files/1/0431/4752/6305/files/6613330176.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/pider.pdf
    • https://cdn.shopify.com/s/files/1/0435/5850/2563/files/54795908745.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/22422144931.pdf
    • https://cdn.shopify.com/s/files/1/0434/4489/5909/files/charles_proxy_3._3._1_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/5246/6325/files/unix_shell_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0449/9157/8276/files/advanced_automotive_technology.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/84567908193.pdf
    • https://cdn.shopify.com/s/files/1/0435/3317/2885/files/wurakupobarowabapiniwugo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2452/3170/files/temple_of_notch.pdf
    • https://cdn.shopify.com/s/files/1/0450/6628/9302/files/70715033302.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/
    • https://cdn.shopify.com/s/files/1/0450/6628/9302/files/70715033

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054fd.bin
02c7116933760ff7a68e16718c67aed814305d10225022eb12edfd9b236d995b
pdf-font-stream PDF embedded font (sfnt) at offset 0x54FD 5072 bytes
font_01_sfnt_off0000662b.bin
14b65f4ca1a67c964625662b2afdf0fda423e025b2f679fb0549476ce5a5c25c
pdf-font-stream PDF embedded font (sfnt) at offset 0x662B 10232 bytes