Malicious PDF — malware analysis report

Static analysis result for SHA-256 532742feb7c7d659…

MALICIOUS

PDF

42.1 KB Created: 2020-08-20 02:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b8b8cdc8fce46beff8849a74e073c75 SHA-1: af2f982ff24f80eede308223b59db37dbe0fad18 SHA-256: 532742feb7c7d659954545281c70c377e5880208f6b55ad59b02704ec01ee7e8
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is largely unreadable, but the presence of the malicious redirector URL and the sheer volume of links suggest an attempt to manipulate search engine results or distribute further malicious 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.com/pify?keyword=basics+of+technical+communication+pdf
    • http://files.dakotawoodcrafts.com/uploads/1/3/0/8/130813876/9610132.pdf
    • https://cdn.shopify.com/s/files/1/0429/6356/6755/files/spotify_agile_framework.pdf
    • https://cdn.shopify.com/s/files/1/0430/0275/7281/files/tijevenojizubunibajobiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/5491/5993/files/xigutipafobebenelut.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/across_the_sea_song.pdf
    • https://cdn.shopify.com/s/files/1/0437/2866/6785/files/tujitezevulemifo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8326/0314/files/banilulonewipudijumuzi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3796/5979/files/fokolavowumagafibevegak.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3032/files/manufacturing_business_plan_proposal.pdf
    • https://cdn.shopify.com/s/files/1/0429/0058/6649/files/45914399196.pdf
    • https://cdn.shopify.com/s/files/1/0449/9714/8830/files/xivemiruzubavutunuderev.pdf
    • https://cdn.shopify.com/s/files/1/0434/6698/1542/files/74438493729.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_off000066f5.bin
4dbbccefd0850cad26b4133a8b1a78451c440ea4a46f45ac8302bb010acf40e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x66F5 5348 bytes
font_01_sfnt_off000078ed.bin
3d362105bce88825e720db5de62c8462ed7fa151a24d545c6c2ed139282c7353
pdf-font-stream PDF embedded font (sfnt) at offset 0x78ED 10056 bytes