Malicious PDF — malware analysis report

Static analysis result for SHA-256 43dda2b5284bb79f…

MALICIOUS

PDF

35.9 KB Created: 2020-08-19 08:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08ec0ff20c308080bdca4685df81a578 SHA-1: 4e5793d9ff0385e180e4ff59933decd11b1e7459 SHA-256: 43dda2b5284bb79f6f05db7213181cfb5cc763535f16f08714ad7b9d703d0228
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.com/pify?keyword=avengers+infinity+war+game+apk', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to 'Avengers infinity war game apk', suggesting a lure to download a fake game. The PDF also hosts a large number of other links, many pointing to Shopify, which is characteristic of a link farm used for SEO poisoning or distributing malicious content.

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=avengers+infinity+war+game+apk
    • http://files.lexiebakes.com/uploads/1/3/2/6/132695278/6b3720.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5431/files/vokurepa.pdf
    • https://cdn.shopify.com/s/files/1/0428/7817/3351/files/lithonia_2blt4_cut_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/9282/8579/files/misutem.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3820/files/60572067119.pdf
    • https://cdn.shopify.com/s/files/1/0433/4921/3349/files/bavuxoxipitategujid.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/lozokibi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0426/4601/files/13377203.pdf
    • https://cdn.shopify.com/s/files/1/0437/7162/5634/files/53908549730.pdf
    • https://cdn.shopify.com/s/files/1/0430/8720/0418/files/53200735661.pdf
    • https://cdn.shopify.com/s/files/1/0437/8502/7745/files/awesome_movie_wallpapers_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0436/1479/7981/files/91745035143.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_off00004c27.bin
977815a37371e443bd671c155fa74e6e1a64f285837351163e4b2394d5a15e2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C27 5496 bytes
font_01_sfnt_off00005ee5.bin
0d53e3435b6d4a8140bdaea1ae52bee24c7e6ac8dc66fa51823009b079f5ed54
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE5 10608 bytes