Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a553711467114b6…

MALICIOUS

PDF

43.5 KB Created: 2020-09-02 13:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e395ddb6299fcecb91f6e4f3b413f59a SHA-1: a6a5225929853830ca8219217ecaace2a8852b65 SHA-256: 1a553711467114b631a217f28e05d170e95118815a859523f254bb312b6b76a8
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that appears to be part of the link farm, directing users to 'ttraff.cc', which is known malicious infrastructure. The PDF also contains numerous links to shopify.com domains, likely part of the link farm strategy.

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.cc/wix?keyword=summer+internship+project+report+format+for+engineering
    • https://cdn.shopify.com/s/files/1/0437/9289/2053/files/93168772316.pdf
    • https://cdn.shopify.com/s/files/1/0434/6013/3031/files/67525794695.pdf
    • https://cdn.shopify.com/s/files/1/0432/7584/5792/files/pubupamitoruvoxuvu.pdf
    • https://cdn.shopify.com/s/files/1/0436/5382/4677/files/69062702507.pdf
    • https://cdn.shopify.com/s/files/1/0434/5928/1061/files/kaditaximiwu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51098187394.pdf
    • https://cdn.shopify.com/s/files/1/0431/5611/1520/files/mabipene.pdf
    • https://cdn.shopify.com/s/files/1/0434/6799/7344/files/penevazibuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/8549/5453/files/49209234208.pdf
    • https://static.usrfiles.com/ugd/99afdc_105182fd5d8f422ea914ca432c13b45a.pdf
    • https://static.usrfiles.com/ugd/ac0094_491d8a3f10f84f4a994f0f6c0b0380fc.pdf
    • https://static.usrfiles.com/ugd/d5415a_f95b0076de474bb4afe8cba7c8092336.pdf
    • https://static.usrfiles.com/ugd/82e28d_e349ed2f85dd419e8d1927debc4f9827.pdf
    • https://cdn.shopify.com/s/files/1/0428/6211/7030/files/batutisi.pdf
    • https://cdn.shopify.com/s/files/1/0436/6955/3305/files/70307698259.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_off00006b98.bin
937da7962978faccb0c48c99ebd7d940772ad050600e07bfb2b7166fb74897c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B98 5576 bytes
font_01_sfnt_off00007e6d.bin
c1bb05aafddbeab884295d77ae6c1e2a411cc2c2da547c0292e627b95e2af76a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E6D 10088 bytes