Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced4d455bbe34c77…

MALICIOUS

PDF

47.3 KB Created: 2020-07-30 03:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14b43f3a14cdd510e2a4c296a9fa8ca8 SHA-1: 28b6e4f0ff4fbe7b11c5a83f8e0a69cfe17d416a SHA-256: ced4d455bbe34c779599387a06c01d5f2cc4e64a5cfac3271314b81b3afcccd3
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. Additionally, it exhibits a PDF link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, limiting the analysis of direct payload delivery mechanisms.

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=difference+between+sql+and+mysql+and+oracle+pdf
    • http://files.theballoondivatwisters.com/uploads/1/3/1/4/131438563/fabarujato.pdf
    • http://files.shiftingloyalties.org/uploads/1/3/2/8/132815123/wajofukelabinokomav.pdf
    • http://files.overcomeporn.org/uploads/1/3/0/7/130739776/47a30b2e7cd.pdf
    • https://cdn.shopify.com/s/files/1/0435/3638/4149/files/73267463588.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5524/files/50359107031.pdf
    • https://cdn.shopify.com/s/files/1/0441/3823/4008/files/makepabuwubitezoge.pdf
    • https://cdn.shopify.com/s/files/1/0431/9189/4176/files/35874706276.pdf
    • https://cdn.shopify.com/s/files/1/0433/1533/1227/files/sunufonivazapeju.pdf
    • https://cdn.shopify.com/s/files/1/0432/9639/1323/files/filene.pdf
    • https://cdn.shopify.com/s/files/1/0430/8611/9079/files/74883825195.pdf
    • https://cdn.shopify.com/s/files/1/0428/6529/5526/files/tujazuxuvikowedovutasez.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/nelaraguwugetovuxesavun.pdf
    • https://cdn.shopify.com/s/files/1/0441/1876/9816/files/27761772162.pdf
    • https://cdn.shopify.com/s/files/1/0434/5217/0392/files/742434427.pdf
    • https://cdn.shopify.com/s/files/1/0430/3133/0969/files/14251342421.pdf
    • https://cdn.shopify.com/s/files/1/0432/3262/4808/files/82835242592.pdf
    • https://cdn.shopify.com/s/files/1/0436/4887/6697/files/lobepusadofisarosal.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_off00007940.bin
9a8a556b1ee6ce52eee58284fcc741415b0f6fd93a4db9ed544505a6f0c94ed5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7940 5548 bytes
font_01_sfnt_off00008c10.bin
8a628aea8b56f020ad81076b59bb3f8f686efbef47558197c91aa1bba6838516
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C10 10360 bytes