Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50a2d086891c6a6…

MALICIOUS

PDF

53.9 KB Created: 2020-08-31 04:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d95dafc2985ea7850247b8d86efff940 SHA-1: d1dd008f20a86a065625843915e6b0a3ec2c2bfe SHA-256: d50a2d086891c6a6a6f7c8919ebfe92573f19670f2ba7d49fdc4d33a302a9851
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 significant number of embedded links. One of these links, 'https://ttraff.ru/wix?keyword=microsoft+sidewinder+gamepad+pro+dri', points to a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting it is a primary lure. The presence of a link farm indicates a potential SEO poisoning or phishing campaign.

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=microsoft+sidewinder+gamepad+pro+dri
    • https://cdn.shopify.com/s/files/1/0430/6462/3265/files/race_to_witch_mountain_hindi_dubbed_hd_movie_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/5459/5224/files/japun.pdf
    • https://cdn.shopify.com/s/files/1/0434/0210/0899/files/61293393784.pdf
    • https://cdn.shopify.com/s/files/1/0461/9419/6643/files/32357181028.pdf
    • https://cdn.shopify.com/s/files/1/0431/7695/1957/files/82770211844.pdf
    • https://cdn.shopify.com/s/files/1/0431/1420/1241/files/67316945770.pdf
    • https://cdn.shopify.com/s/files/1/0461/9413/1093/files/bamipukabut.pdf
    • https://cdn.shopify.com/s/files/1/0440/7951/3752/files/norowapefetofevesuzofale.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_803b8488920d437ab683ca3cc0edf394.pdf
    • https://static.usrfiles.com/ugd/136d07_cf9b8f7761d34a8eb692192af50dfa54.pdf
    • https://static.usrfiles.com/ugd/b8c837_a586055689a44ff191ed48523f317cce.pdf
    • https://static.usrfiles.com/ugd/b8c837_f861ee5715104bb1bcc7f9945812e132.pdf
    • https://static.usrfiles.com/ugd/105a8c_3b22cb2b80974b35b8dd47c952d62219.pdf
    • https://static.usrfiles.com/ugd/191a6d_d2745e38ae4d4e4e946346061b7b1954.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf663ef75b884e2ba445f1a2d681b5c6.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e28315aecf8435088fb6d083d34827a.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_off00009075.bin
eedb8ac92819463ab40acc743e490d2c0295b4c4a6c409204f8b338bb6a42900
pdf-font-stream PDF embedded font (sfnt) at offset 0x9075 5540 bytes
font_01_sfnt_off0000a34e.bin
ca08694cf1693ce8fa351dda621a9b4e33a6c787d8293cc925f41e99af6d1f55
pdf-font-stream PDF embedded font (sfnt) at offset 0xA34E 12060 bytes