Malicious PDF — malware analysis report

Static analysis result for SHA-256 21093386ba54cffb…

MALICIOUS

PDF

46.3 KB Created: 2020-07-28 12:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdf7ce92e78767b773fa2efb98a8a3c5 SHA-1: a31fe838a0c9dcaa4194d59e01f321ed5dcdecfd SHA-256: 21093386ba54cffb987c099e4c40a0d9c40c56af02a7547daa10361369b7201c
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a link farm pointing to a redirector. The primary malicious URL identified is 'https://ttraff.com/pify?keyword=angular+blob++pdf', which is likely used to obscure the ultimate destination of the malicious content. 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.com/pify?keyword=angular+blob++pdf
    • http://files.abookstudio.com/uploads/1/3/1/4/131453588/mebalepawunel.pdf
    • http://files.listingagentofatl.com/uploads/1/3/1/0/131070207/72777210.pdf
    • http://files.skyleslawfirm.com/uploads/1/3/0/8/130873795/e0a4e81840110.pdf
    • https://cdn.shopify.com/s/files/1/0428/3577/1558/files/ragemuguwazarakujap.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38608120386.pdf
    • https://cdn.shopify.com/s/files/1/0432/6627/7531/files/tuwisuwukowapibirobevoliz.pdf
    • https://cdn.shopify.com/s/files/1/0434/3637/6214/files/52245434025.pdf
    • https://cdn.shopify.com/s/files/1/0428/2299/2028/files/kodulekopuro.pdf
    • https://cdn.shopify.com/s/files/1/0430/2897/1674/files/86584787200.pdf
    • https://cdn.shopify.com/s/files/1/0428/5136/9127/files/gezomamukeb.pdf
    • https://cdn.shopify.com/s/files/1/0434/3916/1500/files/623399273.pdf
    • https://cdn.shopify.com/s/files/1/0430/0813/1233/files/lubora.pdf
    • https://cdn.shopify.com/s/files/1/0427/8665/2316/files/8514080327.pdf
    • https://cdn.shopify.com/s/files/1/0441/4416/5016/files/7225657955.pdf
    • https://cdn.shopify.com/s/files/1/0432/2649/7182/files/vemokasixuwuti.pdf
    • https://cdn.shopify.com/s/files/1/0428/0179/1132/files/texowej.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_off00007099.bin
1d8aafcbf3adfa07eff4917cb4974293128121bdb8d873d3fbc85845ef9e5186
pdf-font-stream PDF embedded font (sfnt) at offset 0x7099 4796 bytes
font_01_sfnt_off000080d9.bin
514623c231d8fad0ef3d65f1cf5bedc0adfb82853df24f6a20e39b45b033d513
pdf-font-stream PDF embedded font (sfnt) at offset 0x80D9 13268 bytes