Malicious PDF — malware analysis report

Static analysis result for SHA-256 5935dbad62a8c8a6…

MALICIOUS

PDF

49.3 KB Created: 2020-08-06 22:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd4503368e8e93bfa874b8903749420d SHA-1: c0c05432ec008373d90fea7dcfe29ebf1dcb2f1d SHA-256: 5935dbad62a8c8a60eabc5725c20df8ec86d81556369c9be4c3cc0a63f56ff16
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised with keywords related to anorexia nervosa treatment. The document body also contains this URL and numerous other PDF links, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. The primary attack pattern involves luring the user to a malicious site via a deceptive link.

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=tratamiento+anorexia+nerviosa+pdf
    • http://gorazaxuw.hempsteadxc.com/uploads/1/3/1/4/131438405/9935058.pdf
    • http://files.kcldentalsociety.com/uploads/1/3/1/8/131871721/b91e823f138c50.pdf
    • http://files.ultimatehotspringsguide.com/uploads/1/3/0/7/130775174/zofuvesifa_vixozasegom_kufovanolurik_numekudexomig.pdf
    • http://files.kshnisbetarteach.com/uploads/1/3/0/7/130739404/marojopemob_dunija_jaxiwukofeso.pdf
    • http://files.marburgshowsociety.com.au/uploads/1/3/1/1/131164399/891092.pdf
    • https://cdn.shopify.com/s/files/1/0434/2205/6600/files/lonuxatazopewekoro.pdf
    • https://cdn.shopify.com/s/files/1/0431/8514/3969/files/repomeverawuf.pdf
    • https://cdn.shopify.com/s/files/1/0441/1123/3176/files/opposite_of_contract.pdf
    • https://cdn.shopify.com/s/files/1/0431/6659/7288/files/445864160.pdf
    • https://cdn.shopify.com/s/files/1/0431/0574/7108/files/gutafagusivegufipesime.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7637/files/common_laboratory_apparatus_and_uses.pdf
    • https://cdn.shopify.com/s/files/1/0433/0982/6213/files/fojaludatalujifutamowed.pdf
    • https://cdn.shopify.com/s/files/1/0432/5372/7387/files/gegefuvajudajom.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/bifazerekabilasolo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7291/3557/files/67326206142.pdf
    • https://cdn.shopify.com/s/files/1/0438/6072/1829/files/58851783831.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/zogomawekamozupafo.pdf
    • https://cdn.shopify.com/s/files/1/0428/6359/1590/files/76982035491.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_off0000820c.bin
0e974598a7d629328bfdc85b1fad27db1d0a3e5885485ff9afe216548a6837c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x820C 5232 bytes
font_01_sfnt_off000093ca.bin
d87236dd0621ef42c6badc278dc6469272fdb1bfbf7c5fde0b4dab25cb6a0ca5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93CA 11164 bytes

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