Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbfd0a65a0b3f756…

MALICIOUS

PDF

42.8 KB Created: 2020-08-21 17:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7ba208aabcebd9a721626c4d771266d SHA-1: ddaffe8205f029d80fc2deeb32bac81f111f3a9c SHA-256: cbfd0a65a0b3f7569b7f63165f1f3056f956afe5631a39c4ac3e0aa5b8d1e82c
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link to 'ttraff.com' which is associated with malicious activity. The document body, though heavily obfuscated, contains references to 'audiomack premium apk free' and numerous PDF links, suggesting a lure to a potentially malicious download or phishing site. The ML classifier strongly indicated maliciousness, and the presence of a redirector link confirms a malicious intent to lead the user to a harmful destination.

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=audiomack+premium+apk+free
    • http://files.rugbyfootball.com/uploads/1/3/1/4/131407388/fukaxawenuwajanib.pdf
    • http://files.lindveit.com/uploads/1/3/1/3/131397946/2435943.pdf
    • http://files.theliteraturefactory.com.au/uploads/1/3/2/3/132302907/moganafezizewan.pdf
    • http://tumuluf.trademoves.net/uploads/1/3/1/4/131453950/vedododugulipa-lerisarowe-vobirar.pdf
    • http://files.alissweettreats.com/uploads/1/3/0/8/130874495/mepovaro.pdf
    • https://cdn.shopify.com/s/files/1/0430/8942/8637/files/52617276496.pdf
    • https://cdn.shopify.com/s/files/1/0429/9046/9283/files/80593085550.pdf
    • https://cdn.shopify.com/s/files/1/0431/5974/8769/files/abc_in_french.pdf
    • https://cdn.shopify.com/s/files/1/0432/7538/7043/files/66508840302.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/anita_anita_song_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6166/files/jofedofoxavaw.pdf
    • https://cdn.shopify.com/s/files/1/0436/8410/2297/files/keynote_template_free_business.pdf
    • https://cdn.shopify.com/s/files/1/0427/6443/5612/files/smooth_4_gimbal_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/5609/5644/files/jovawobesixupawud.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_off0000688f.bin
ab4696f78fa660821fa28569e13d26746957fef3c14fdb20403aee84d25d8f00
pdf-font-stream PDF embedded font (sfnt) at offset 0x688F 5144 bytes
font_01_sfnt_off000079fd.bin
2c0e148567ba49874d454d9fe57ea40f464afa7623e73abe2e5f12fe522a1a65
pdf-font-stream PDF embedded font (sfnt) at offset 0x79FD 10748 bytes