Malicious PDF — malware analysis report

Static analysis result for SHA-256 5776d7e04d27bc33…

MALICIOUS

PDF

32.6 KB Created: 2020-09-01 07:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39454ead2d72f6ee2fa07271122a3ccf SHA-1: 10d56af6c65e7460792e379ae5e23f017970fcba SHA-256: 5776d7e04d27bc3386226f9897a91c3b2072ac390241d173c37d7419888a9f71
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a link farm with numerous external links. One of these links, https://ttraff.ru/wix?keyword=zedge+best+flute+ringtone, points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to lure users to malicious sites.

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.ru/wix?keyword=zedge+best+flute+ringtone
    • https://static.usrfiles.com/ugd/b8c837_50a9bc808d9d48369d9a1cb6912bac81.pdf
    • https://static.usrfiles.com/ugd/739437_c48248964a2b44dfa512ff1ba2c3e19a.pdf
    • https://static.usrfiles.com/ugd/b8c837_626a42b00ac241278c55a1596d4feacd.pdf
    • https://static.usrfiles.com/ugd/735189_d2f0a4c4b469486bafed280de47d6979.pdf
    • https://static.usrfiles.com/ugd/2f8cea_f87c8138197f4c018c2ac8762014e3ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_e02fd5b81f1b4eb8909d192f86466ecc.pdf
    • https://static.usrfiles.com/ugd/79cb75_a4a961227d0846dba2cb7ff20d593e16.pdf
    • https://static.usrfiles.com/ugd/f09a9d_298535b94a9d491ab71d7fdfb121e743.pdf
    • https://cdn.shopify.com/s/files/1/0431/1361/1413/files/rokarilubulakijuxogizuwo.pdf
    • https://cdn.shopify.com/s/files/1/0438/1428/9568/files/body_code_chart.pdf
    • https://cdn.shopify.com/s/files/1/0434/6842/3330/files/definicion_de_control_de_calidad_segun_autores.pdf
    • https://cdn.shopify.com/s/files/1/0434/1573/2376/files/lepepawi.pdf
    • https://cdn.shopify.com/s/files/1/0464/7183/9894/files/jurolejobiramiwapizuda.pdf
    • https://cdn.shopify.com/s/files/1/0432/0195/3952/files/89484617871.pdf
    • https://cdn.shopify.com/s/files/1/0434/3998/0710/files/mukanejinel.pdf
    • https://cdn.shopify.com/s/files/1/0429/2784/9639/files/gugibutirotidugagu.pdf
    • https://cdn.shopify.com/s/files/1/0450/7625/0776/files/biblia_nvi_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0429/5340/8675/files/farow.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_off00004598.bin
972b820dabe83f7b2600536014e760570e7319cf0520a679ce10ec679e566388		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4598 4960 bytes
font_01_sfnt_off0000568b.bin
611d181851dd96bb2aed49953e1a7587c5d2c69da5d39c21341f2455ec0d230c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x568B 9072 bytes

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