Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a4569f78bc7438…

MALICIOUS

PDF

45.8 KB Created: 2020-08-05 15:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21189553db00b7f74886bd84f5a4e87a SHA-1: a2b6942271d4b547fc90045399eabe829990d260 SHA-256: 92a4569f78bc743828e1bd6f14c7548e9a61f2011abe11813bc6f5e69d008975
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains hosting PDF files, suggesting a link farm for SEO manipulation or traffic redirection. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is used to obscure the final destination. The document body, though partially corrupted, contains text related to a textbook download, reinforcing the lure. The ML classifier 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.cc/pify?keyword=handbook+of+psychological+assessment+5th+edition+pdf+free+download
    • http://files.gaylebunchart.com/uploads/1/3/1/4/131437308/9438487.pdf
    • http://files.acrossthebridgeinc.com/uploads/1/3/1/4/131407148/3760545.pdf
    • http://files.northshorereaching.ca/uploads/1/3/1/3/131380546/lijedadotoforiw_sajosujebefuf.pdf
    • http://files.hammermarks.net/uploads/1/3/1/3/131383553/6798320.pdf
    • http://files.brunswicktours.com/uploads/1/3/1/3/131380456/mavefozulenewod_madaluzujixug_potofur_sakefazixugonek.pdf
    • https://cdn.shopify.com/s/files/1/0433/1018/6654/files/kurujuwekuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/3387/7914/files/74565043394.pdf
    • https://cdn.shopify.com/s/files/1/0434/8759/2608/files/dabavomo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gifizazuxapi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9888/9635/files/zojubo.pdf
    • https://cdn.shopify.com/s/files/1/0437/9879/0301/files/ripoduwesogusafanob.pdf
    • https://cdn.shopify.com/s/files/1/0430/0714/8185/files/xowisoselokabenoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/4741/1096/files/76087239037.pdf
    • https://cdn.shopify.com/s/files/1/0437/6539/9713/files/28703972985.pdf
    • https://cdn.shopify.com/s/files/1/0431/6348/4315/files/84990555576.pdf
    • https://cdn.shopify.com/s/files/1/0434/2965/8790/files/sovorubipuwoweruzexuneme.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000646d.bin
9decdacf229e5c9d1e82958bf95588d0be6fff84cb697492b6dd758625ffba43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x646D 5840 bytes
font_01_sfnt_off00007830.bin
021df480538fd81b6c3d6e1a852d39de962acd50fb60c21c95d093292a4de7a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7830 10228 bytes
font_02_sfnt_off00009b3f.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B3F 4324 bytes

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