Malicious PDF — malware analysis report

Static analysis result for SHA-256 57757ba9887cd7d6…

MALICIOUS

PDF

47.5 KB Created: 2020-08-07 20:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c50b4f35c9813811e60b9a0f032901b3 SHA-1: 2b936d4ad973ad7b100a8e5239358e36ba50a995 SHA-256: 57757ba9887cd7d6efbeb72f61374b354aaf4493d63e00abc8da61b75435218c
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though partially obfuscated, contains the text 'Incident at absalom station pdf' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly supports the malicious verdict.

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=incident+at+absalom+station+pdf
    • http://files.msfullfigureddmv.com/uploads/1/3/2/3/132302764/7263586.pdf
    • http://files.cedarhillclub.com/uploads/1/3/2/7/132740723/8078578.pdf
    • http://files.mr-stevens.com/uploads/1/3/0/7/130776864/zoxakaso.pdf
    • https://cdn.shopify.com/s/files/1/0435/1868/9432/files/11411681938.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52325197595.pdf
    • https://cdn.shopify.com/s/files/1/0432/3740/8936/files/12604337798.pdf
    • https://cdn.shopify.com/s/files/1/0432/2328/5928/files/29773465823.pdf
    • https://cdn.shopify.com/s/files/1/0434/1415/9521/files/jubipukuwukigufeje.pdf
    • https://cdn.shopify.com/s/files/1/0429/4259/5239/files/tovizifavumutojafadagidug.pdf
    • https://cdn.shopify.com/s/files/1/0431/3156/8290/files/vivurunujolezamubogokixin.pdf
    • https://cdn.shopify.com/s/files/1/0448/0565/2637/files/types_of_cutting_tools_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9157/files/can_you_qss_vi_ult.pdf
    • https://cdn.shopify.com/s/files/1/0431/7780/3925/files/jigogixinakabudifujeja.pdf
    • https://cdn.shopify.com/s/files/1/0435/5715/9063/files/5607578488.pdf
    • https://cdn.shopify.com/s/files/1/0434/0360/8214/files/26213558368.pdf
    • https://cdn.shopify.com/s/files/1/0429/5249/1159/files/vujutajutivukefuv.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_off000070e4.bin
594cc94c4bc42473bfb5b45c17a70dbb754b83f994c69d62836b94fef37f2a7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x70E4 5280 bytes
font_01_sfnt_off000082c7.bin
5f0a43d52a648c7745ddd6469ca336046d75885ee96eeeae2a11a3f7d995a9cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x82C7 14808 bytes