Malicious PDF — malware analysis report

Static analysis result for SHA-256 67921d4d813d1239…

MALICIOUS

PDF

40.2 KB Created: 2020-08-30 04:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ac319ad97aa0373af21444bb121ce33 SHA-1: 245f7beffc58bb95edfcdd805b32132e7adddfb9 SHA-256: 67921d4d813d123951d0cd69db0842044b5b312a4f80aefe16e81f5c90512faf
162 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a download for Windows 8 Professional. This is further supported by the PDF_SEO_LINK_FARM heuristic, indicating a large number of outbound links, and the ML classifier's high confidence score. The document body, though heavily obfuscated, contains the same lure text and URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.cc/wix?keyword=windows+8+professional+64+bit+iso+download+microsoft
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8589/7627/files/34948647023.pdf
    • https://cdn.shopify.com/s/files/1/0440/5598/6341/files/junipodomomaluri.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/ffxiv_buying_a_house.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/xidixefipeb.pdf
    • https://cdn.shopify.com/s/files/1/0430/6783/4517/files/babusan_all_song.pdf
    • https://cdn.shopify.com/s/files/1/0438/0337/7824/files/37951510779.pdf
    • https://cdn.shopify.com/s/files/1/0429/7093/9541/files/mafuforozabofi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1536/5020/files/59391307506.pdf
    • https://cdn.shopify.com/s/files/1/0429/8794/6143/files/larousse_orthographe_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0430/6727/7469/files/burda_shareef_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0429/5399/8487/files/27835799575.pdf
    • https://static.usrfiles.com/ugd/e2c250_0ee1151c295c4b8e9f073fcb7a12ced3.pdf
    • https://static.usrfiles.com/ugd/b8c837_7b0802ceeb5943a8aaa651290dabf73b.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c30d21a8b8c4586b5e78b68638c2b08.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_off00005c78.bin
bafbc5cb9bdd20144257332143eed47025a0eafdbf486eb9a7bf8cbf5a09615c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C78 5984 bytes
font_01_sfnt_off000070d4.bin
e700f0aa3604fa991ae74e410e4fba5b64fe9ccf9285f32c0045fb3e1b283167		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70D4 10192 bytes

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