Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33aae76ea5e864e…

MALICIOUS

PDF

43.0 KB Created: 2020-08-25 04:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfa8fe32593fba03674456a88ae3d723 SHA-1: 513d0c8af9a4a78274d4467548daf823f61043de SHA-256: c33aae76ea5e864e935f3f605cada9ea36c65dde3d957455593c157e99438165
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to host further malicious content. The document body, though partially corrupted, contains keywords related to 'Airtel nigeria apn settings for android 4g', suggesting a lure to trick users into clicking the malicious link. The presence of numerous external PDF links further indicates a link farm or redirection strategy.

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.ru/pify?keyword=airtel+nigeria+apn+settings+for+android+4g
    • http://files.kodaliners.com/uploads/1/3/1/4/131438190/9633671.pdf
    • http://files.321letshavefun.co.uk/uploads/1/3/1/4/131407148/xomobeguvebudexa.pdf
    • https://cdn.shopify.com/s/files/1/0427/9782/6207/files/30753209292.pdf
    • https://cdn.shopify.com/s/files/1/0427/8052/4710/files/lojagovaxo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3867/7924/files/killing_the_black_body.pdf
    • https://cdn.shopify.com/s/files/1/0432/3059/3192/files/68139814950.pdf
    • https://cdn.shopify.com/s/files/1/0440/7663/0181/files/xebop.pdf
    • https://cdn.shopify.com/s/files/1/0435/4270/8378/files/asme_y14._5m-_1994.pdf
    • https://cdn.shopify.com/s/files/1/0437/0857/9993/files/ropudik.pdf
    • https://cdn.shopify.com/s/files/1/0429/7395/4204/files/sexirimivim.pdf
    • https://cdn.shopify.com/s/files/1/0431/5735/6710/files/pneumonia_aspirasi_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0434/8110/4541/files/vosuziwuzonalawikopejogel.pdf
    • https://cdn.shopify.com/s/files/1/0432/1571/6516/files/tokofaweb.pdf
    • https://cdn.shopify.com/s/files/1/0433/3702/3641/files/an_introduction_to_agricultural_systems.pdf
    • https://cdn.shopify.com/s/files/1/0431/5080/3095/files/cee_lo_green_height.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_off00006c17.bin
482b69b889e49bc0d2aa7c3ef45b33082ac57d49e5d8d06c0908969833f7e0e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C17 5284 bytes
font_01_sfnt_off00007e1a.bin
b525525cee982b761fcd2f87396cbde16a554e4397836dd380e57b25d686b7f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E1A 9648 bytes