Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d8574e9b6836db…

MALICIOUS

PDF

41.8 KB Created: 2020-08-11 02:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea6eff5578f51dde4d632aa94aeeca1b SHA-1: ac65f89fb11a64deac4f947a197acba98cecf5f7 SHA-256: c4d8574e9b6836db66edd70441344f991f92cf34138eda006099526331f92898
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to 'advertising graphic design pdf' and the malicious URL, suggesting a lure. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm designed to improve search engine ranking for 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.cc/pify?keyword=advertising+graphic+design+pdf
    • http://files.ferald.net/uploads/1/3/2/6/132682113/tuwabuped-barowagomupif.pdf
    • http://febibe.casapalomabandb.com/uploads/1/3/1/4/131408849/zulumipojarete.pdf
    • http://files.pdbravard.com/uploads/1/3/2/3/132302871/f96e0644.pdf
    • https://cdn.shopify.com/s/files/1/0433/6805/4949/files/man_tera_hero_song.pdf
    • https://cdn.shopify.com/s/files/1/0438/3267/2418/files/56201789138.pdf
    • https://cdn.shopify.com/s/files/1/0434/1419/2284/files/logitech_keybaord_disable_tap_to_click.pdf
    • https://cdn.shopify.com/s/files/1/0434/5823/2473/files/zotexole.pdf
    • https://cdn.shopify.com/s/files/1/0431/0410/8711/files/2020_ashrae_handbook_hvac_applications_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/0177/4233/files/vibuvenoluto.pdf
    • https://cdn.shopify.com/s/files/1/0432/2702/1480/files/949472411.pdf
    • https://cdn.shopify.com/s/files/1/0432/8390/6724/files/nanuwirilosakanizifenu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2844/6358/files/riwix.pdf
    • https://cdn.shopify.com/s/files/1/0433/5498/0505/files/diwejelumijofofexifafeti.pdf
    • https://cdn.shopify.com/s/files/1/0435/5578/2819/files/situkopaxikel.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_off000063d5.bin
1e07dbf84eb1bd0e960ac8884564d09a603e733beaa1c125f26496c0ac96ff6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x63D5 5436 bytes
font_01_sfnt_off00007651.bin
9a0e72f6ab211987b5b64b556b14da6bb3658505738bfa9a0bc07fb8ce1ad5e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7651 10768 bytes