Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b05e2f0495584f…

MALICIOUS

PDF

44.3 KB Created: 2020-08-05 18:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc50ece69e106d0225631ba78b18345c SHA-1: 73fdb92c5d84cd947a9fca98eeb9609a869ce7e1 SHA-256: b5b05e2f0495584f25d9d7fa31b4a9cc3181e621bea1d8a77c06960187be6b9a
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to deliver a secondary payload. The document body and embedded URLs suggest a lure related to academic materials, specifically a calculus textbook. The presence of numerous external PDF links, many hosted on Shopify, indicates a potential SEO poisoning or link farm tactic to distribute the malicious content. No scripts were extracted, but the primary malicious action is the redirection to the malicious URL.

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/pify?keyword=calculus+volume+1+op.+pdf
    • http://files.claudiacait.com/uploads/1/3/1/3/131380008/a3dff9.pdf
    • http://files.lovemehemp.net/uploads/1/3/2/6/132695388/fegevegexu.pdf
    • http://files.labellaphotographysa.com/uploads/1/3/1/4/131482944/xipuj.pdf
    • http://files.ironbridge-analytics.com/uploads/1/3/1/6/131606563/bodolexivedazaxubegu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3243/5093/files/najedoginimovuzuri.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21086069096.pdf
    • https://cdn.shopify.com/s/files/1/0431/5987/9841/files/73338241370.pdf
    • https://cdn.shopify.com/s/files/1/0432/8646/2620/files/watafarizi.pdf
    • https://cdn.shopify.com/s/files/1/0437/9151/5797/files/9479575143.pdf
    • https://cdn.shopify.com/s/files/1/0434/2163/0631/files/2538918855.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/37278413385.pdf
    • https://cdn.shopify.com/s/files/1/0428/6119/9526/files/24449713726.pdf
    • https://cdn.shopify.com/s/files/1/0437/1080/8216/files/zuduzigalopejetele.pdf
    • https://cdn.shopify.com/s/files/1/0428/2207/4534/files/5e_tunnel_fighter.pdf
    • https://cdn.shopify.com/s/files/1/0432/9707/9460/files/75546387224.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_off00005b61.bin
a15eeb7978b88807d81db4ae008db72f68a32d5fdea49011d4eebf264e96d521		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B61 5020 bytes
font_01_sfnt_off00006c94.bin
7f2c448c9e6377e0257327300be868a721b07dff12a62a2cded35a943b3a1d83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C94 13056 bytes
font_02_sfnt_off0000962a.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x962A 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.