Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cadc40e4d8e7116…

MALICIOUS

PDF

42.6 KB Created: 2020-08-22 18:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b96ef1265d64a16b3df5ccc1dbb927d SHA-1: 04581001681593b0ed014656fcb405d323a8afcb SHA-256: 1cadc40e4d8e711687479155fda37182b88dcc5d6cae03474f1289fb4ec3a0fa
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector infrastructure at ttraff.cc. The document body, though heavily obfuscated, contains the same malicious URL, suggesting the primary intent is to redirect the user to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=usmc+sergeants+course+administration+answers
    • http://files.arcturusfoundation.com/uploads/1/3/1/4/131452840/rezarara.pdf
    • http://files.myhouseofjeans.com/uploads/1/3/2/8/132815178/5111026.pdf
    • http://files.concretejunglefarms.com.au/uploads/1/3/1/4/131437378/be9dd04aeb.pdf
    • http://mawujute.misplacedchef.com/uploads/1/3/0/8/130814328/kifef.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/47878122177.pdf
    • https://cdn.shopify.com/s/files/1/0428/9508/1625/files/megigarosuxefikamurak.pdf
    • https://cdn.shopify.com/s/files/1/0433/1218/5502/files/tivularasapipagivuwawin.pdf
    • https://cdn.shopify.com/s/files/1/0429/1156/3932/files/adobe_photoshop_cc_2020_shortcut_keys.pdf
    • https://cdn.shopify.com/s/files/1/0434/2490/7414/files/1013175765.pdf
    • https://cdn.shopify.com/s/files/1/0434/0210/0899/files/79304707995.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vukabisozudetilo.pdf
    • https://cdn.shopify.com/s/files/1/0464/2403/1384/files/compellent_fs8600_spec_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/0167/5939/files/craft_beer_brewing_process.pdf
    • https://cdn.shopify.com/s/files/1/0437/0120/7193/files/banjara_banjara_video_song.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46496449222.pdf
    • https://cdn.shopify.com/s/files/1/0433/4416/7064/files/kolorigowuduseman.pdf
    • https://cdn.shopify.com/s/files/1/0438/0560/6049/files/jeppesen_airway_manual_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kexikebesadunav.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_off000066e1.bin
9a1a3b2b630b36c5341c1da57494a2429bba10b1bd2f26d3ec0844faf5b6abfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66E1 5312 bytes
font_01_sfnt_off000078db.bin
0ca115326ae0bfc03db0e853bff0f28209bd0c6929b58080eaf1ec83d5af6025		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78DB 10660 bytes

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