Malicious PDF — malware analysis report

Static analysis result for SHA-256 0245af12c10f2c26…

MALICIOUS

PDF

42.7 KB Created: 2020-08-17 18:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3f8a3cef7fe99f4ed7a898ffcb1a222 SHA-1: fa171aa3d51a6ad0a0cec31544bda2f92c641c69 SHA-256: 0245af12c10f2c26baecd624af573105ee45976ef76a6e158845b649cd85345e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to formatting an SD card, suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm designed to distribute malicious content or traffic. The ML classifier strongly flagged this PDF as malicious.

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=format+sd+card+ubuntu+ext4
    • http://files.shanepsingh.com/uploads/1/3/1/4/131406855/6268538.pdf
    • http://files.hayleyhudson.com/uploads/1/3/0/7/130739789/cd859.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/5816/5925/files/936_483_2979.pdf
    • https://cdn.shopify.com/s/files/1/0435/6092/7393/files/curriculum_vitae_online.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73881495537.pdf
    • https://cdn.shopify.com/s/files/1/0429/6212/4959/files/kigurag.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sarozasupevukofapunaxovu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2953/6668/files/kerafepedab.pdf
    • https://cdn.shopify.com/s/files/1/0432/9367/1588/files/87466449797.pdf
    • https://cdn.shopify.com/s/files/1/0432/6414/7609/files/adversus_jovinianum.pdf
    • https://cdn.shopify.com/s/files/1/0445/6411/9716/files/cypress_export_test_report.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c2e.bin
d7d3af263ba55dc0a9c0b99817fc6003871bac2400fb848b7c067defce2e3b21
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C2E 5304 bytes
font_01_sfnt_off00006e18.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E18 1800 bytes
font_02_sfnt_off000076a5.bin
93da4c1f0fa8eef1f775890140608d9220f9b499de6da7237af4d552f3e4f469
pdf-font-stream PDF embedded font (sfnt) at offset 0x76A5 12156 bytes