Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e549d984e23e4a…

MALICIOUS

PDF

63.5 KB Created: 2020-07-26 15:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35c5b818e94d0f09e5e1eb03ef8a8ddb SHA-1: 0631921a00b135c81c0d85bb60981fbf0805be73 SHA-256: f6e549d984e23e4a493efc7e1ac8f61ff4eb3af54e0b793f1350865556cd230f
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure on ttraff.ru. Another critical heuristic indicates a link farm of SEO-optimized PDFs hosted on Shopify, suggesting a coordinated effort to drive traffic to malicious sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact lure.

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/pify?keyword=relationship+marketing+meaning+pdf
    • http://files.gaindetalks.com/uploads/1/3/0/8/130874629/dojoja-kefuzegomoli-wadab.pdf
    • http://files.planetaindigena.com/uploads/1/3/1/0/131069819/8377732.pdf
    • http://files.wanderingsofalix.com/uploads/1/3/1/4/131453650/duxolelidokidusil.pdf
    • http://files.onegirlgig.com/uploads/1/3/1/3/131381414/3581243.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/19490865332.pdf
    • https://cdn.shopify.com/s/files/1/0433/7798/3653/files/mojowe.pdf
    • https://cdn.shopify.com/s/files/1/0437/6294/2113/files/6429702475.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/tusawogapilibefafa.pdf
    • https://cdn.shopify.com/s/files/1/0434/1845/2120/files/81316578118.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27482348981.pdf
    • https://cdn.shopify.com/s/files/1/0432/3855/5805/files/jowabaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/4571/6129/files/getepakumalomikumarofot.pdf
    • https://cdn.shopify.com/s/files/1/0428/8361/2831/files/32195869009.pdf
    • https://cdn.shopify.com/s/files/1/0435/6869/3411/files/47967562277.pdf
    • https://cdn.shopify.com/s/files/1/0430/5872/5015/files/subabipotalekuwuwu.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_off0000ba63.bin
e76711d4f6f96bbdcac8e7e72a756b93b529b8285ff938d40916cee7047c4378
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA63 5312 bytes
font_01_sfnt_off0000cc46.bin
eff6fb55d4564868618be337c8a3989b632e425e69005b1febeb458bbb65bd9c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC46 10636 bytes