Malicious PDF — malware analysis report

Static analysis result for SHA-256 86166c2f3920bdd4…

MALICIOUS

PDF

63.9 KB Created: 2020-08-18 20:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d50945588fc2f3a91c593cc3988574c4 SHA-1: 868a87f8b494fdfbde3d971b65b271b40aa515a9 SHA-256: 86166c2f3920bdd41df2920c591ab025199762c73b8bd6c486d351a2ebf16e8f
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one heuristic specifically identifying a link farm and another flagging a redirector to a known malicious domain (ttraff.com). The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and other PDF-related text, suggesting a lure to external 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=cardiomyopathy+definition+pdf
    • http://levosogap.glennhousevr.com/uploads/1/3/2/7/132740930/2080770.pdf
    • http://files.qacloud0.com/uploads/1/3/0/8/130814254/wamatexabidem.pdf
    • http://files.nikkiallred.com/uploads/1/3/0/7/130738889/fogobobexukud.pdf
    • http://xovenej.cascadegriffs.com/uploads/1/3/1/8/131856372/rifetijejixegamaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/0764/7639/files/laperevikatasivo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4606/7621/files/6281240818.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9302/files/amphioxus_journal.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/pugasefopu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5840/4245/files/contaminacion_atmosferica_causas_y_consecuencias.pdf
    • https://cdn.shopify.com/s/files/1/0428/6211/7020/files/grooveshark_playlist_recovery.pdf
    • https://cdn.shopify.com/s/files/1/0433/3325/5323/files/lemomekudorevevikub.pdf
    • https://cdn.shopify.com/s/files/1/0429/3849/9235/files/26560870171.pdf
    • https://cdn.shopify.com/s/files/1/0429/0877/8663/files/android_samsung_mobile_phones_under_4000.pdf
    • https://cdn.shopify.com/s/files/1/0433/3781/0075/files/weginekexitipatukeketok.pdf
    • https://cdn.shopify.com/s/files/1/0432/5238/3904/files/wdc_smartware_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/3964/6108/files/start_mysql_server_mac.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000986a.bin
b41bea1b6452f752dbfebed22a84b2b90fbc40f7202eadc28c3945cc57bd146b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x986A 2868 bytes
font_01_sfnt_off0000a29d.bin
7bf1d34f039f76bfd6b1134ce82b3763dd29be0a9b941d2f9c657f67247c5636		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA29D 5076 bytes
font_02_sfnt_off0000b3ca.bin
dead337314529a9aff37a1b4816511c1fea7f443aa69c5b83ba499c2e33c6d96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CA 12608 bytes
font_03_sfnt_off0000dc5f.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5F 16204 bytes

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