Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a388b6797cf3145…

MALICIOUS

PDF

55.5 KB Created: 2020-08-26 01:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f29ecc2f3d39b82fe944ab53a51d056b SHA-1: fc3c0f31f501f9904b1c0dfe150fd059f4759df2 SHA-256: 1a388b6797cf3145868d2f753960dc7445bd9a4285c79d36b71f8e31ce8afe1d
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 hosting other PDFs, and one critical link to a known malicious redirector. This indicates a link farm strategy, likely intended to lure users to malicious content or phishing 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.com/pify?keyword=bdo+ornella+amity+guide
    • http://files.garlicfeast.com/uploads/1/3/2/7/132740329/35da8ca2c.pdf
    • http://files.filgohomeinspections.com/uploads/1/3/1/4/131453144/pakasidu.pdf
    • https://cdn.shopify.com/s/files/1/0437/4082/3706/files/24730325604.pdf
    • https://cdn.shopify.com/s/files/1/0434/9450/6661/files/fovopadumodisusalo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0558/3266/files/cdc_pediatric_immunization_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0430/6118/2617/files/76179740818.pdf
    • https://cdn.shopify.com/s/files/1/0428/5664/4774/files/dojuxoxarixomodinulegoji.pdf
    • https://cdn.shopify.com/s/files/1/0433/4315/1272/files/zivofexo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1430/7496/files/51423541564.pdf
    • https://cdn.shopify.com/s/files/1/0454/6196/2910/files/bekuvobirumazijuduf.pdf
    • https://cdn.shopify.com/s/files/1/0432/7063/5678/files/maruzuvigewebejukotu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6294/2101/files/96215145503.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_off000076ee.bin
584252add93717ad6c0e315956eaa35a50defab0a201be63da30f629ca67642d
pdf-font-stream PDF embedded font (sfnt) at offset 0x76EE 5116 bytes
font_01_sfnt_off0000883d.bin
eb8466b332564a1e02bb8a2d30194636e455fb91b641a57d315b5fbb91157077
pdf-font-stream PDF embedded font (sfnt) at offset 0x883D 10076 bytes
font_02_sfnt_off0000a47b.bin
6177c96acf35c325db8e0783cc9a2675e1bcb7b42e6b36afac55257f46ca0335
pdf-font-stream PDF embedded font (sfnt) at offset 0xA47B 14440 bytes