Malicious PDF — malware analysis report

Static analysis result for SHA-256 418e1b359c0d74e7…

MALICIOUS

PDF

40.6 KB Created: 2020-08-24 20:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebab30bed5dd668672e0a279472e4a5d SHA-1: 17fb83f89dbb65e9aea310b8c82eaa15926524ca SHA-256: 418e1b359c0d74e7fe54e214c8c9934171a9ff4cd832dcddf67aac03caccb3aa
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The primary malicious URL is ttraff.ru, which is used in conjunction with a keyword suggesting a lure for software downloads. The document body contains garbled text, but the presence of the URL and the heuristic firings are sufficient to determine the attack pattern.

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=mpc+player+for+pc+free
    • http://files.dubbeststore.com/uploads/1/3/0/7/130739962/suxudod.pdf
    • https://cdn.shopify.com/s/files/1/0432/2285/9943/files/arma_3_lakeside_life.pdf
    • https://cdn.shopify.com/s/files/1/0439/3802/1531/files/cellular_lipid_metabolism.pdf
    • https://cdn.shopify.com/s/files/1/0433/1818/2041/files/classroom_actions_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jatud.pdf
    • https://cdn.shopify.com/s/files/1/0440/5687/1062/files/1323968028.pdf
    • https://cdn.shopify.com/s/files/1/0429/1647/9132/files/android_phone_under_30000.pdf
    • https://cdn.shopify.com/s/files/1/0434/8523/3304/files/mujepamak.pdf
    • https://cdn.shopify.com/s/files/1/0434/3952/1958/files/40535710255.pdf
    • https://cdn.shopify.com/s/files/1/0437/1808/2709/files/embroidery_stitches_names.pdf
    • https://cdn.shopify.com/s/files/1/0435/6584/2595/files/xominetetojixorevekuw.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_off0000625b.bin
35b23f21b8d35ea1a352b03e6dda229b577b4a36e6b2d7a403d94d6e9e32e35d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x625B 4936 bytes
font_01_sfnt_off0000734b.bin
97a00e7f9c2763555018a1940d2ed2a574dadc58fdfb39f63fe9b385e50db76f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x734B 10192 bytes

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