Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6a93caf83298a5…

MALICIOUS

PDF

50.5 KB Created: 2020-08-19 03:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf29cdebd7e2f2db6b3d015456e15b3f SHA-1: f26d2ed728556e65f47ad10c1db6918a08115aca SHA-256: cf6a93caf83298a51b985fad6f83385dd7c0e153ac904d81f21f7c00241842de
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=coffee+meets+bagel+app'. This indicates the document's primary purpose is to lure the user to this malicious site. The presence of numerous other external links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious URL. The ML classifier also strongly flagged this PDF as malicious.

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=coffee+meets+bagel+app
    • http://sapodopi.basketballhelp.net/uploads/1/3/0/8/130873954/cc31ba2075.pdf
    • http://mekawi.archiopedia.org/uploads/1/3/0/8/130813650/muxitepelupego_dalivafib_rukuduvazepoli_jeluwozudagik.pdf
    • http://pafosom.thebakingpixie.com/uploads/1/3/1/4/131407089/pawelufevibe.pdf
    • http://juvugon.smiths2colombia.com/uploads/1/3/1/6/131636725/fefaxafasoba.pdf
    • https://cdn.shopify.com/s/files/1/0440/9946/9464/files/37716596031.pdf
    • https://cdn.shopify.com/s/files/1/0428/0087/3631/files/77955728220.pdf
    • https://cdn.shopify.com/s/files/1/0432/3013/4427/files/jiduzigafivigofunakoxemut.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/zolavilopujagi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xugifewelogukepebokiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/4485/4165/files/32749221501.pdf
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/73973732642.pdf
    • https://cdn.shopify.com/s/files/1/0437/1959/0040/files/senaxosodigomi.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3494/files/koneroje.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5082/files/gelaxowazujunik.pdf
    • https://cdn.shopify.com/s/files/1/0430/0485/4426/files/radha_krishna_bhajan_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0438/3123/0624/files/videojet_1520_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9114/9471/files/88402542213.pdf
    • https://cdn.shopify.com/s/files/1/0430/6403/3429/files/vobewezubavavakuji.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/
    • https://cdn.shopify.com/s/files/1/0440/9946/9464/files/3771

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078da.bin
3a89d13f494a17ecf8849f62a78e32508607fda0494befaeaba768e4dbd6e244		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78DA 4924 bytes
font_01_sfnt_off000089a9.bin
3eb5142f227b74ba4c5f30c8ec4e040a516f8e63f8fa3b4af47c30287afb7919		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89A9 10720 bytes
font_02_sfnt_off0000ae54.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE54 4324 bytes

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