Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e1cfccba1b25ba…

MALICIOUS

PDF

46.0 KB Created: 2020-08-23 04:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa5c42812d45f7da2f163d1d1c332357 SHA-1: 553b197ec975ad7c513ee2a217ef4e8ff8c07d64 SHA-256: 42e1cfccba1b25babef1b775692100ec3673b08abc334be556ec5e15d9dbfb33
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised with a keyword related to water testing. The PDF also features a link farm of numerous external PDFs hosted on Shopify, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

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=coliform+test+well+water
    • http://mutitosi.sisterssangha.org/uploads/1/3/0/9/130969521/rurodaduro.pdf
    • https://cdn.shopify
    • https://cdn.shopify.com/s/files/1/0432/3321/4621/files/61928872637.pdf
    • https://cdn.shopify.com/s/files/1/0440/6371/9574/files/echo_srm_225_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/4320/9895/files/12894549603.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1542/files/delegojigodidiwi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/roxaxazag.pdf
    • https://cdn.shopify.com/s/files/1/0435/8671/5805/files/juzobinisufirarebexuja.pdf
    • https://cdn.shopify.com/s/files/1/0427/5830/8006/files/dovakamelutawifo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9535/9642/files/12606679173.pdf
    • https://cdn.shopify.com/s/files/1/0431/7629/6614/files/walmart_cashier_training_online.pdf
    • https://cdn.shopify.com/s/files/1/0438/1753/3597/files/anatomia_y_fisiologia_del_higado_y_pancreas.pdf
    • https://cdn.shopify.com/s/files/1/0431/1711/7589/files/39872691209.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_off00006abe.bin
cbc7fd96037c7b04b2df186574338a5bcc39a7f50ec440b07ef741414efa518f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ABE 4712 bytes
font_01_sfnt_off00007ac9.bin
78ff459a48400422ab8f5255970daa75fc874afb770285d2d38bf5d2a4ce265f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC9 9996 bytes
font_02_sfnt_off00009cf8.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9CF8 4324 bytes