Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fd7731fbc74f239…

MALICIOUS

PDF

43.6 KB Created: 2020-07-30 22:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88b3d6a9815ea0d7bf96a138a0600cc5 SHA-1: 30093d1e1b94e23942a5f54421155ef0e1b77e1a SHA-256: 0fd7731fbc74f239f8652b5982eac3d3b227d2194dfaede8d37a244783a130f8
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for PDF_SEO_LINK_FARM indicating a link farm. One of these links, ttraff.cc, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of embedded URLs and the link farm heuristic suggest a malicious intent to redirect users to potentially harmful sites.

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.cc/pify?keyword=cardiomegalia+canina+pdf
    • http://files.mckinneysfoodcenter.com/uploads/1/3/1/6/131606563/b0b44cfe5c6.pdf
    • http://files.damianshishkin.com/uploads/1/3/0/7/130740213/rezumebuweza.pdf
    • http://files.justinmikos.com/uploads/1/3/1/4/131437977/jadepizarilolikogeru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1357/0709/files/zivotawilegotinu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1741554469.pdf
    • https://cdn.shopify.com/s/files/1/0438/3188/5986/files/juvogapiwufoluliwijonewum.pdf
    • https://cdn.shopify.com/s/files/1/0431/1721/5905/files/9085901808.pdf
    • https://cdn.shopify.com/s/files/1/0435/2658/6519/files/13357167142.pdf
    • https://cdn.shopify.com/s/files/1/0432/3780/2146/files/94680799135.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/54482675285.pdf
    • https://cdn.shopify.com/s/files/1/0431/7973/7237/files/39793010736.pdf
    • https://cdn.shopify.com/s/files/1/0430/8697/1029/files/42417103376.pdf
    • https://cdn.shopify.com/s/files/1/0433/6372/9557/files/92257903689.pdf
    • https://cdn.shopify.com/s/files/1/0431/4244/7265/files/gilopibupenab.pdf
    • https://cdn.shopify.com/s/files/1/0430/1648/7065/files/tomonewe.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_off00006e05.bin
9eedc13b820ed3225b81cfb2b90125351027b2825c94ad191b4b3278dccb3fa4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E05 5028 bytes
font_01_sfnt_off00007f05.bin
daf3dcb15c1c34d9dc328e85bb82cfaf1e209a2be8a6427bf6e112d8d36fb653
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F05 10236 bytes