Malicious PDF — malware analysis report

Static analysis result for SHA-256 310e4b1403ad4959…

MALICIOUS

PDF

53.2 KB Created: 2020-09-03 11:40:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f135d77d22d48deba2d5610510cf388 SHA-1: 5b23c3f37486a5ec95b343fd2d85ab3bca20922e SHA-256: 310e4b1403ad4959b0c332bb06ffaf4ae77b18a9d797eb5e2a5d5bc505880c38
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external PDF files. The primary malicious URL identified is https://ttraff.link/pify?keyword=android+api+19+release+date, which is likely used to funnel victims to a phishing or malware distribution site.

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.link/pify?keyword=android+api+19+release+date
    • https://cdn.shopify.com/s/files/1/0432/0077/4308/files/78535474761.pdf
    • https://cdn.shopify.com/s/files/1/0433/5275/2283/files/32263215465.pdf
    • https://cdn.shopify.com/s/files/1/0433/0012/6885/files/47133606807.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9302/files/gobatimabubokadikuda.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/99456974581.pdf
    • https://cdn.shopify.com/s/files/1/0432/0899/9072/files/dictionnaire_belgicisme.pdf
    • https://cdn.shopify.com/s/files/1/0430/5436/6877/files/70104759222.pdf
    • https://cdn.shopify.com/s/files/1/0440/9052/3813/files/bollywood_news_movies.pdf
    • https://static.usrfiles.com/ugd/6350c7_d245d44563ea431fa578dc92d19f5409.pdf
    • https://static.usrfiles.com/ugd/ecd213_267c47c60b5d42c683c5a78f11b4458a.pdf
    • https://static.usrfiles.com/ugd/10a4aa_79364ba0903541dda57f6872416bc12e.pdf
    • https://static.usrfiles.com/ugd/a771bd_04749c454e6d4ea48ffe1dc7d84c26b9.pdf
    • https://static.usrfiles.com/ugd/12745a_0c039217b7424a5991b2295fae59d87c.pdf
    • https://static.usrfiles.com/ugd/1fa6dd_06ddbfd3176d4c89916bd7f6d246d105.pdf
    • https://static.usrfiles.com/ugd/ac72e0_3a3fd945046b422cb3e6d05cb26bd984.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_off000087df.bin
280dcd3a7eb1fc4691d9529fd558bc71da61c4f0302e56802c2a10ad5f78c291
pdf-font-stream PDF embedded font (sfnt) at offset 0x87DF 5152 bytes
font_01_sfnt_off00009974.bin
a04be3bf36a5d4eb3d50da7abcd4fd6db94044bbb53d70d30d8815cbf813ee65
pdf-font-stream PDF embedded font (sfnt) at offset 0x9974 14740 bytes