Malicious PDF — malware analysis report

Static analysis result for SHA-256 6468e3bb12c75990…

MALICIOUS

PDF

47.4 KB Created: 2020-08-31 12:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c5f0940782271e668d1237f386b7024 SHA-1: 9b7f447e6a14ca0d8cac42536d253aab08acd01e SHA-256: 6468e3bb12c75990e6087e50999d38757779f86206cefbacd1c984ec8655a8c7
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic to disguise malicious intent. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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/wix?keyword=super+tomahawk+chipper+shredder
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1339/7924/files/17255110916.pdf
    • https://cdn.shopify.com/s/files/1/0431/6777/6919/files/21325574181.pdf
    • https://cdn.shopify.com/s/files/1/0448/1345/1430/files/ethiopian_grade_10_chemistry_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/8786/3715/files/aciduria_glutarica_tipo_2.pdf
    • https://cdn.shopify.com/s/files/1/0432/2718/5309/files/wifabobomekufexufomefob.pdf
    • https://cdn.shopify.com/s/files/1/0432/8423/4396/files/learn_italian_alphabet.pdf
    • https://static.usrfiles.com/ugd/72216b_0454a00d5da74a18b64ca313fd933fdf.pdf
    • https://static.usrfiles.com/ugd/b5472a_f114c56f402e41c3a88c78414eca446a.pdf
    • https://static.usrfiles.com/ugd/36f25b_c0462d41c0e2400b880e5314aa8e6c82.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6fa9a903a1f4da1a6b4070563175ce3.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ac3c43eabc7466497d2b29eb1063d4c.pdf
    • https://static.usrfiles.com/ugd/76de1a_133ee70a128640f7b29e5285d916a274.pdf
    • https://static.usrfiles.com/ugd/576447_a845a0bfc6c0444a9b15a6e55b0de3ce.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ff3186acd834b2e8529789e18225bd5.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a99.bin
1473651fd4d4733a91fce18899379492fda476e7a7d61e676b6102b20cc06525
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A99 5540 bytes
font_01_sfnt_off00008d54.bin
d1267bfb94e1551117eeb8c0eebd1c2e04c532c823ea60e23bd941b307a83454
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D54 10472 bytes