Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f07dbd2b39cc28…

MALICIOUS

PDF

52.6 KB Created: 2020-09-01 06:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 367f0a5e84b4687ee8544c36949392ec SHA-1: 0bf6d730c803f1d92b98d4a12a7e97c3fda21b5b SHA-256: 77f07dbd2b39cc28d5cc03ce95dfdab78eb1436ef6d65d13b641c0fbccd33b08
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, with a keyword suggesting a lure for data analytics templates. It also features a large number of external PDF links, many pointing to Shopify domains, which is indicative of a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the malicious redirector and the link farm structure strongly suggest a malicious intent, likely to drive traffic to malicious sites or for SEO poisoning.

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.com/wix?keyword=data+analytics+template+google+sheets
    • https://static.usrfiles.com/ugd/22bf55_7dc5fda013904948a9d69124cba0c13d.pdf
    • https://static.usrfiles.com/ugd/756799_5a618f8a7d634fefa8e84a267acd1195.pdf
    • https://static.usrfiles.com/ugd/b8c837_0444f4670e5641759cd886d5c46e78c8.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/aleluia_cohen_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0447/9811/6006/files/data_analytics_laboratory_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/7732/0352/files/wenukapezegizasa.pdf
    • https://cdn.shopify.com/s/files/1/0432/6375/4408/files/acl_2020_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0435/1744/4264/files/fubopobibixafominitugo.pdf
    • https://cdn.shopify.com/s/files/1/0435/8835/4207/files/materiales_de_restauracion_en_odontopediatria.pdf
    • https://cdn.shopify.com/s/files/1/0427/7813/2636/files/xovofifunugaxuvoratafi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2733/2245/files/9861551184.pdf
    • https://cdn.shopify.com/s/files/1/0433/9888/9621/files/34685707307.pdf
    • https://static.usrfiles.com/ugd/73cb9e_8566f98ce1b94620a993164ec2e15673.pdf
    • https://static.usrfiles.com/ugd/d94ae5_32fd6273cba14d05a57ba0c9946744ff.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_off00009013.bin
caffb75e4a981b7931c4078b30fe480ced768b9afc41c12f386554bcf3862192
pdf-font-stream PDF embedded font (sfnt) at offset 0x9013 5352 bytes
font_01_sfnt_off0000a237.bin
b7aa659d768be5e38b03b938cbb8b144e3efa1380ebaa74c4f0e2f03c43d821c
pdf-font-stream PDF embedded font (sfnt) at offset 0xA237 10416 bytes