Malicious PDF — malware analysis report

Static analysis result for SHA-256 f886f257cf6ee1fe…

MALICIOUS

PDF

36.7 KB Created: 2020-08-08 05:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23b9b9386c5c3fd75bf2fda3a3dda50b SHA-1: c657ed7202c94ffb52fa87fec0bfe2212fd9a1ec SHA-256: f886f257cf6ee1fe93a62ca70488d20deff765df49fe89ff1804cda79d9729cc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, many of which are hosted on Shopify domains and appear to be part of an SEO spam or link farm tactic. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that at least one of these links points to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to click on these links, potentially leading to further malicious content or exploitation.

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/wb?keyword=greater%20than%20less%20than%20math%20worksheets%20for%20kindergarten
    • http://files.learnfrombarrymaterials.com/uploads/1/3/1/4/131406498/xutofowewisiwo-luwowawa.pdf
    • http://files.elizabethtint.com/uploads/1/3/1/8/131871864/59fb4de7dbba.pdf
    • http://files.ovahimbablackgermanshepherds.com/uploads/1/3/1/4/131437987/visasetefarepas.pdf
    • https://cdn.shopify.com/s/files/1/0436/0683/5358/files/oxy_acetylene_welding.pdf
    • https://cdn.shopify.com/s/files/1/0431/9019/0248/files/vukufubiredotomajopixa.pdf
    • https://cdn.shopify.com/s/files/1/0432/8351/3499/files/detagolunifaxowop.pdf
    • https://cdn.shopify.com/s/files/1/0432/0631/2093/files/37584624057.pdf
    • https://cdn.shopify.com/s/files/1/0431/3989/1357/files/2002_jeep_grand_cherokee_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/7679/6057/files/tigalemajaga.pdf
    • https://cdn.shopify.com/s/files/1/0440/8036/5720/files/rav4_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0444/3917/5335/files/ielts_speaking_full_test.pdf
    • https://cdn.shopify.com/s/files/1/0432/2613/6743/files/versus_arthritis_back_pain.pdf
    • https://cdn.shopify.com/s/files/1/0437/1241/3851/files/kojuzuvivovewebavaso.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6976/files/18019924738.pdf
    • https://cdn.shopify.com/s/files/1/0434/1281/6034/files/canada_immigration_form_download.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_off0000519d.bin
a37ea2449ce10159fdd2406951bb8dc9f78e50b2b1b9cbe2999fd63789c8d622		 pdf-font-stream PDF embedded font (sfnt) at offset 0x519D 5508 bytes
font_01_sfnt_off00006440.bin
e2fbb40e6fae3ada673771c78be1c3d3753ff1da5aa64edf944959c6ecf4d44d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6440 9788 bytes

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