Malicious PDF — malware analysis report

Static analysis result for SHA-256 d685e707d00ba6cd…

MALICIOUS

PDF

46.4 KB Created: 2020-08-08 11:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1964af80057e04def27c44c8a61d125 SHA-1: a661ef4c1ae42430d2bace9bb68fa7b322689dab SHA-256: d685e707d00ba6cdb11f72f0632b3c5cf9a6a804d0870116c901777e79de1800
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=umbilical+hernia+baby+pdf'. It also exhibits characteristics of a PDF link farm, with numerous external links, many hosted on cdn.shopify.com. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. 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.cc/pify?keyword=umbilical+hernia+baby+pdf
    • http://files.stanalexander.com/uploads/1/3/0/7/130738883/6345060.pdf
    • http://files.theartexhibitla.com/uploads/1/3/1/4/131438459/gugufotewatukajifere.pdf
    • http://ludukew.lauralandphotography.com/uploads/1/3/2/8/132816202/1618433.pdf
    • http://files.gammaetaomegaaka.org/uploads/1/3/1/6/131636990/5608641.pdf
    • https://cdn.shopify.com/s/files/1/0431/3183/0421/files/git_to_subversion.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/vojiranesowasug.pdf
    • https://cdn.shopify.com/s/files/1/0429/2660/4447/files/faruju.pdf
    • https://cdn.shopify.com/s/files/1/0434/9578/4600/files/45296901788.pdf
    • https://cdn.shopify.com/s/files/1/0427/7462/6470/files/85078393330.pdf
    • https://cdn.shopify.com/s/files/1/0433/6893/9672/files/gugofosiselavekovimegin.pdf
    • https://cdn.shopify.com/s/files/1/0431/2042/7157/files/91564345257.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/26595239554.pdf
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/93389845600.pdf
    • https://cdn.shopify.com/s/files/1/0439/0027/2792/files/70030696202.pdf
    • https://cdn.shopify.com/s/files/1/0429/9869/4049/files/40379643772.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_off00006bd6.bin
40d18ddd6f325cba97c40853441fe78b7072ce4c1cd36fce231d6b54bd9aed10
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BD6 5048 bytes
font_01_sfnt_off00007cc2.bin
562f6cf8c828926a11814bb603784ae14be079b972ea401cb7a005cdc2edc6d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC2 9956 bytes
font_02_sfnt_off00009ee4.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x9EE4 4324 bytes