Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d006cf7a5f1312c…

MALICIOUS

PDF

37.7 KB Created: 2020-08-18 22:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8a388a0edb43f8b79f02b353ec88e70 SHA-1: cc00947162f547513caefa8f2f0881b6e83048e5 SHA-256: 1d006cf7a5f1312c09375f701190a36e751b9239595b55e512c4261c53469148
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and references to a 'Pepsi logo png', suggesting a lure. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves redirecting the user to malicious infrastructure.

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.ru/pify?keyword=pepsi+logo+png
    • http://files.angelsandwine.com/uploads/1/3/0/7/130775432/mowakomorelonuwupon.pdf
    • https://cdn.shopify.com/s/files/1/0432/0159/3505/files/27799649898.pdf
    • https://cdn.shopify.com/s/files/1/0431/7442/8829/files/ratozuvorujimibewesejava.pdf
    • https://cdn.shopify.com/s/files/1/0428/3249/4751/files/jazupatixun.pdf
    • https://cdn.shopify.com/s/files/1/0440/4497/6278/files/21853532765.pdf
    • https://cdn.shopify.com/s/files/1/0436/1001/3853/files/93313409900.pdf
    • https://cdn.shopify.com/s/files/1/0437/4927/7845/files/zubemajekawota.pdf
    • https://cdn.shopify.com/s/files/1/0433/7732/8286/files/35646832203.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dogudanivivakow.pdf
    • https://cdn.shopify.com/s/files/1/0440/7204/2661/files/4389115705.pdf
    • https://cdn.shopify.com/s/files/1/0431/8072/0294/files/bexagegipapenoli.pdf
    • https://cdn.shopify.com/s/files/1/0446/7798/8505/files/introduction_to_html_css_and_javascript.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f1d.bin
682fe68e6b071cb0a0255b49fc13fe6037115cf0e27f9e8a38da6eec3f8be32d
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F1D 4684 bytes
font_01_sfnt_off00005f19.bin
a7921e1f22a3b9f131f1d26e0a30b1579b95f06bc21b675b004e759a1faecb7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F19 1728 bytes
font_02_sfnt_off000067b4.bin
3de2c378ce39239cc4d8d0051793b3cdccb8f9e679f3e80b8c2b064b2c3ca3c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x67B4 10120 bytes