Malicious PDF — malware analysis report

Static analysis result for SHA-256 331da0c8e41197ab…

MALICIOUS

PDF

43.2 KB Created: 2020-10-17 14:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e227e132b0aed62cb74ee5034b5c1489 SHA-1: 1a7ad8811453995a10715d0de8da7027e8c90121 SHA-256: 331da0c8e41197ab759d0b51bff6172c85b9220ffff7920581e4525618717a82
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.me/123?keyword=gbwhatsapp+latest+version+apk+download+6.60'. The document body also contains this URL and numerous other links, many hosted on 'uploads.strikinglycdn.com', suggesting a link farm designed to distribute malicious content. The ML classifier also strongly indicated maliciousness.

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.me/123?keyword=gbwhatsapp+latest+version+apk+download+6.60
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/tedawonuf.pdf
    • https://xazapadikud.weebly.com/uploads/1/3/1/8/131871762/546312.pdf
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/mexitivow_zapeweredo_kemigofine_tijogorugevit.pdf
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/6594323.pdf
    • https://jopalezaleloloj.weebly.com/uploads/1/3/1/3/131380469/5954599.pdf
    • https://tenagudewujuga.weebly.com/uploads/1/3/1/1/131164273/rikigun-gugemuguzeveg.pdf
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/foguxek_woxogonedifuk.pdf
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/1ff0e8e3.pdf
    • https://jiwadurator.weebly.com/uploads/1/3/0/7/130776405/gitiwebopusose.pdf
    • https://uploads.strikinglycdn.com/files/a5dfba2d-ff88-42ac-9ed5-1e13a5b70521/60807179060.pdf
    • https://uploads.strikinglycdn.com/files/b1c4d395-8611-42b4-b75b-ba37412f10f1/pakobuj.pdf
    • https://uploads.strikinglycdn.com/files/4c2544ed-e615-4d7b-9108-470d23a51e87/kovewilit.pdf
    • https://uploads.strikinglycdn.com/files/b2e04155-f724-49bd-aa33-12acbe0cc531/68395253320.pdf
    • https://uploads.strikinglycdn.com/files/dbaba2da-9433-40ef-b872-d8a8b3dee457/libro_formacion_civica_y_etica_4_grado.pdf
    • https://cdn.shopify.com/s/files/1/0438/9755/3064/files/how_can_dams_work.pdf
    • https://cdn.shopify.com/s/files/1/0499/3187/8562/files/wufawewaketevezi.pdf
    • https://cdn.shopify.com/s/files/1/0501/1505/1685/files/33903939078.pdf
    • https://cdn.shopify.com/s/files/1/0502/2072/8478/files/dodunix.pdf
    • https://cdn.shopify.com/s/files/1/0500/9355/5877/files/one_command_creations_bedrock.pdf
    • https://cdn.shopify.com/s/files/1/0492/0351/1445/files/30793167078.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/1/0500/9355/5877/files/one_command_creations_bedrock

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006795.bin
7e3fd5e5b743b3654ec89922f67c2ed2b244784757077e286dd327c3a3bcb0fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6795 5764 bytes
font_01_sfnt_off00007b47.bin
54be1546617709e9afe7fbc29ba32969c85d316e00dfdbcad7dfb947c666dbeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B47 10648 bytes

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