Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f297cd8ec8f9b8c…

MALICIOUS

PDF

47.7 KB Created: 2020-07-31 09:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97f51e161db6563226879355a0e69f9f SHA-1: 70e24dad286405eb11e44b05b0f222f1ec772ba2 SHA-256: 6f297cd8ec8f9b8ce1f76478eadbab6ef1d25cfafab67a2d2cd27e49b072068b
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be garbled, but the presence of a link farm and a malicious redirector suggests an attempt to lure users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself is leveraged for the attack.

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=fries+rearrangement+mechanism+pdf
    • http://files.faithbaptistalturas.org/uploads/1/3/1/3/131381288/filimutotu.pdf
    • http://files.rsinternationalday.com/uploads/1/3/0/8/130814209/kiribukujire.pdf
    • http://files.stopittop.com/uploads/1/3/0/8/130814106/nokolemafojesawuvowu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1510/0822/files/zupadetizem.pdf
    • https://cdn.shopify.com/s/files/1/0439/9045/0334/files/17933591202.pdf
    • https://cdn.shopify.com/s/files/1/0428/4468/4454/files/fuzoririk.pdf
    • https://cdn.shopify.com/s/files/1/0440/6411/2805/files/detaxodirujiw.pdf
    • https://cdn.shopify.com/s/files/1/0429/7395/4204/files/buxetawebulavebute.pdf
    • https://cdn.shopify.com/s/files/1/0427/4470/9276/files/zipamewijisejafewipuf.pdf
    • https://cdn.shopify.com/s/files/1/0438/3513/0018/files/mogunenas.pdf
    • https://cdn.shopify.com/s/files/1/0430/3015/1330/files/zutevelinebidorade.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zokiwu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3845/7501/files/31700782318.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007216.bin
fc36e34ad0ab527553c6173be9ac26fb0b3002eaab86e524a41f26a496c8dfaf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7216 3212 bytes
font_01_sfnt_off00007d8a.bin
f84f35ddbf478cf183ab583252cd6e806042275b3a4890cd60741d789c978982
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D8A 5168 bytes
font_02_sfnt_off00008eea.bin
2c022fae357c6ff3989475ef5c2ca534c1b0fc5a7ba93d9682ad9bc85ba07b69
pdf-font-stream PDF embedded font (sfnt) at offset 0x8EEA 9992 bytes