Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c124a249b76a79…

MALICIOUS

PDF

41.7 KB Created: 2020-08-10 06:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a8d536b756802b90f8a6b6da0ecc77c SHA-1: 519acd04ea99c89aa2dc106b33d42a3464bff9c8 SHA-256: 13c124a249b76a7943c0e9844ee36b3fc2359fb1d4fb63a109055f19c57b2eb0
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure (https://ttraff.cc/pify?keyword=d+d+artificer+revised+pdf), indicating an attempt to direct users to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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=d+d+artificer+revised+pdf
    • http://files.laurakretz.com/uploads/1/3/0/7/130738799/1893ae5b838483.pdf
    • http://files.chattanoogaaudubon.org/uploads/1/3/0/9/130969511/fukame.pdf
    • http://woguvigud.silviastitch.com/uploads/1/3/0/8/130814124/8512387.pdf
    • http://files.pacificadoctor.com/uploads/1/3/1/3/131383541/a3a4fd7f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2816/9375/files/elementary_classical_analysis_marsden_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/7920/3992/files/pepuluxegajak.pdf
    • https://cdn.shopify.com/s/files/1/0433/3692/5342/files/denakevomulon.pdf
    • https://cdn.shopify.com/s/files/1/0437/8873/0525/files/fenezaso.pdf
    • https://cdn.shopify.com/s/files/1/0435/8068/6495/files/chinua_achebe_short_stories.pdf
    • https://cdn.shopify.com/s/files/1/0434/6304/9376/files/6110219925.pdf
    • https://cdn.shopify.com/s/files/1/0432/5962/5627/files/pepafevu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6214/8763/files/munafanobepo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/memew.pdf
    • https://cdn.shopify.com/s/files/1/0432/1745/3211/files/hernia_inguinal_pediatria_medigraphic.pdf
    • https://cdn.shopify.com/s/files/1/0428/9947/2550/files/ugly_electrical_reference_book.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000669c.bin
911a887ae0a34b416ae6afa76c043ea6b791dfc088c0699b727394d243920d63
pdf-font-stream PDF embedded font (sfnt) at offset 0x669C 5176 bytes
font_01_sfnt_off00007859.bin
d2d322de506727710bd3cec787a049a2dade0e0dec03837d33c79e01f543dae8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7859 10016 bytes