Malicious PDF — malware analysis report

Static analysis result for SHA-256 73487f2e13dcf3f1…

MALICIOUS

PDF

39.2 KB Created: 2020-08-31 00:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b5ebd0b9c0cf7b0653a9e4ec2510404 SHA-1: d366ea2b7c640ac78278d7b9b4742d5d2231c96f SHA-256: 73487f2e13dcf3f1bc3cc94d8f2c14f9499ea5bd87722089a40e10437d49f44b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to external PDF files hosted on Shopify. One of these links, however, leads to a known malicious redirector. The document body itself is heavily obfuscated but contains the malicious URL, suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness.

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.me/wix?keyword=alineacion+real+madrid
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4103/8229/files/finufi.pdf
    • https://cdn.shopify.com/s/files/1/0436/0654/0445/files/clep_test_study_guides_college_algebra.pdf
    • https://cdn.shopify.com/s/files/1/0437/6992/1688/files/xigegofiwo.pdf
    • https://static.usrfiles.com/ugd/b8c837_51e18f378204404bb747b8fc34048345.pdf
    • https://static.usrfiles.com/ugd/b8c837_acc9de464a35427b99cb71e95afca048.pdf
    • https://static.usrfiles.com/ugd/01e791_488a0551e66e4b10b222c7dc62fbd90f.pdf
    • https://static.usrfiles.com/ugd/a31856_6f9e5044c9c948d6b1fb8e4b6e71b4b2.pdf
    • https://static.usrfiles.com/ugd/f80014_d6a5fd1756e5459c9c3e4bf54ed80193.pdf
    • https://static.usrfiles.com/ugd/078c79_a084889591b649bb9b29a020d85a0b65.pdf
    • https://static.usrfiles.com/ugd/b8c837_034fe068f00c4feab4e6424493976977.pdf
    • https://static.usrfiles.com/ugd/b8c837_98b8e68f9a124837b2e32dd7f6625552.pdf
    • https://static.usrfiles.com/ugd/b8c837_968179c5d19949a79b476ff8024bd77b.pdf
    • https://static.usrfiles.com/ugd/8b49c6_836780ae2fab449fa77c2e434f06bd57.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ca9c50f915d4097875c6793898e5a7e.pdf
    • https://static.usrfiles.com/ugd/760101_faac81f5d6c44996bbe51630e0d79590.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_off00005ded.bin
a0406abe3826980e7ebb0675294041231160dcb6108443fee3a1dfa7c4b4707f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DED 4896 bytes
font_01_sfnt_off00006e70.bin
26828d9601642ac4f94b377911d26184a7297878b2340f552487941bb31583e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E70 9956 bytes