Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f69161c8658096…

MALICIOUS

PDF

65.6 KB Created: 2020-07-27 01:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 117ee019fabfe185f67c5cac08cb6d88 SHA-1: 7f87f55b44605511926c8f7292a8b96c9656e895 SHA-256: 44f69161c8658096b08647929efbfe06761215353e2c492b83e5bf10af247264
192 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a high number of embedded links. One of these links points to a known malicious redirector, ttraff.ru, which is likely used to distribute further malicious content or phishing pages. The document body appears to be obfuscated or corrupted, but the presence of a link farm suggests an attempt to manipulate search engine results or distribute malware through seemingly legitimate-looking PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits
  • 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/pify?keyword=runescape+combat+training+guide+osrs
    • http://files.foxlairwest.com/uploads/1/3/1/4/131454699/nubefuduraruma.pdf
    • http://files.movimientomexicano2018.org/uploads/1/3/0/8/130873798/366127.pdf
    • http://files.rinehimerelectric.com/uploads/1/3/2/6/132695829/1589122.pdf
    • http://files.alexislyras.com/uploads/1/3/0/7/130776791/nefonorokamov.pdf
    • https://cdn.shopify.com/s/files/1/0428/6221/5324/files/26288502497.pdf
    • https://cdn.shopify.com/s/files/1/0432/1856/7335/files/nubaxa.pdf
    • https://cdn.shopify.com/s/files/1/0427/7708/4070/files/zigopagevesugaju.pdf
    • https://cdn.shopify.com/s/files/1/0432/9200/0406/files/28875180823.pdf
    • https://cdn.shopify.com/s/files/1/0432/4684/6107/files/70719928929.pdf
    • https://cdn.shopify.com/s/files/1/0431/7170/9092/files/69067668719.pdf
    • https://cdn.shopify.com/s/files/1/0431/1983/7345/files/3830326541.pdf
    • https://cdn.shopify.com/s/files/1/0433/1965/6603/files/13441290616.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gekisemegudifusoledo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/xosisagilolimevefupor.pdf
    • https://cdn.shopify.com/s/files/1/0433/0792/5654/files/76421279202.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/6091145869.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_off0000be72.bin
6842cf4595944e4f40b8bc38a8149f23e4c465f7c76eb99634334d8f52d90f2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE72 5392 bytes
font_01_sfnt_off0000d0a2.bin
e71030ebafd89f63a1b16afe1919660f631ad8082a3a66aae947edd3addfaa1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A2 12444 bytes

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