Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c79a2831b420f35…

MALICIOUS

PDF

40.6 KB Created: 2020-08-19 09:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b0fa491fd02fd74987a0a52307c58d2 SHA-1: e0fc77aa720ad15af2b203f5b88bce427009e87c SHA-256: 1c79a2831b420f35576ab52f6554e73f479d6fcd85815b28e63fb26fe2c72365
154 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, indicative of a link farm. The primary malicious URL identified is https://ttraff.ru/pify?keyword=thinking+out+loud++mp4, which is likely used to redirect users to further malicious content. The document body contains garbled text but includes the same keyword found in the URL, suggesting a lure. No scripts were extracted from this sample.

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=thinking+out+loud++mp4
    • http://files.touchoflovewellness.com/uploads/1/3/0/9/130969192/6994966.pdf
    • https://cdn.shopify.com/s/files/1/0432/5448/1058/files/towifikeruwev.pdf
    • https://cdn.shopify.com/s/files/1/0431/4470/8245/files/15621578997.pdf
    • https://cdn.shopify.com/s/files/1/0457/7224/3110/files/retug.pdf
    • https://cdn.shopify.com/s/files/1/0431/3055/2474/files/91839902722.pdf
    • https://cdn.shopify.com/s/files/1/0440/7033/8725/files/abolition_of_slavery_and_slave_trade.pdf
    • https://cdn.shopify.com/s/files/1/0437/8935/3109/files/xujenumovupavat.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mosagewenusuwaguxizekud.pdf
    • https://cdn.shopify.com/s/files/1/0430/6547/5229/files/zumuxejozilokimugu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/calculus_complete_course.pdf
    • https://cdn.shopify.com/s/files/1/0447/5338/7674/files/unique_binary_search_trees_ii.pdf
    • https://cdn.shopify.com/s/files/1/0435/5427/5479/files/77732718388.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_off000060f3.bin
7897a3730504f7bd8d7ffa3a4418bf7570581a057d53e4dd38989fad7e8f9596
pdf-font-stream PDF embedded font (sfnt) at offset 0x60F3 4992 bytes
font_01_sfnt_off000071c7.bin
396220cedbe59e61812da376c978fabd3c53f46484efa4b843aefe1df494ce81
pdf-font-stream PDF embedded font (sfnt) at offset 0x71C7 10628 bytes