Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa8fbc47a831582…

MALICIOUS

PDF

41.3 KB Created: 2020-08-09 04:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35078fc2401f08d684cd5a796dc75ddc SHA-1: 2d1d22f976642d95e7f385aa8eb5b6c8e0e86482 SHA-256: 1aa8fbc47a831582328bdf39dcf0f06c7755440ed3e79dfe8f5266aeb315ac8e
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one to a known malicious redirector at 'ttraff.com'. The document body text, though partially garbled, includes keywords like 'Autocad pdf driver download', suggesting a lure to trick users into clicking the malicious link. 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.com/pify?keyword=autocad+pdf+driver+download
    • http://files.jdjohnsonhorn.com/uploads/1/3/1/4/131438228/jigina-japunuvan-mogolisejes.pdf
    • http://figinijon.lowcountrymodela.org/uploads/1/3/1/1/131163635/9194466.pdf
    • http://files.stonebard.com/uploads/1/3/1/4/131437149/717591.pdf
    • http://files.thresholdsorganizationco.com/uploads/1/3/1/6/131637562/d3a2698.pdf
    • http://files.microskytech.com/uploads/1/3/1/4/131437254/ramifova_rowabupekisano_tadiza_zuxopirasenegaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9797/files/minecraft_op_sword_command.pdf
    • https://cdn.shopify.com/s/files/1/0440/2960/8101/files/mozawukewugodo.pdf
    • https://cdn.shopify.com/s/files/1/0428/6794/9724/files/97106284846.pdf
    • https://cdn.shopify.com/s/files/1/0437/5917/3784/files/mosofetav.pdf
    • https://cdn.shopify.com/s/files/1/0429/8542/2997/files/dogadoxox.pdf
    • https://cdn.shopify.com/s/files/1/0431/4434/7802/files/17701752039.pdf
    • https://cdn.shopify.com/s/files/1/0432/7456/7843/files/woleg.pdf
    • https://cdn.shopify.com/s/files/1/0428/8898/6783/files/454482391.pdf
    • https://cdn.shopify.com/s/files/1/0436/2331/7662/files/38802715583.pdf
    • https://cdn.shopify.com/s/files/1/0430/3192/0794/files/assessment_center_ejemplos.pdf
    • https://cdn.shopify.com/s/files/1/0430/8851/1130/files/zolug.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063a3.bin
5574700954780ed5af9446fe8deaf1cab1b95660852c8c0a554d3dffd4b94f02
pdf-font-stream PDF embedded font (sfnt) at offset 0x63A3 5112 bytes
font_01_sfnt_off00007533.bin
81d3d767229ce6d2c7eea38caae66336421b7b9a7f70945a1b3fdfde726328fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x7533 10328 bytes