Malicious PDF — malware analysis report

Static analysis result for SHA-256 54903047b22dbc00…

MALICIOUS

PDF

40.5 KB Created: 2020-08-04 08:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed28b0efe07cc26d30bd818f53709f4d SHA-1: e9ad3f0656e54dddad325a7b66210d0a7dc6b7d4 SHA-256: 54903047b22dbc00a849f12d25ac7cf194e01654189393c5c07f3ea43a04ba1c
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.com/pify?keyword=english+grammar+exercises+for+class+6+pdf, which is also flagged as a malicious redirector. The presence of a large number of external PDF links, many hosted on cdn.shopify.com, suggests a link farm designed to obscure the ultimate malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=english+grammar+exercises+for+class+6+pdf
    • http://files.authorkayshanee.com/uploads/1/3/1/0/131069887/d597f107ad3b.pdf
    • http://files.ijbmjournal.com/uploads/1/3/2/6/132696263/wuwitegukuwa.pdf
    • http://files.katelintours.com/uploads/1/3/1/4/131407572/votigefebogatu.pdf
    • http://files.zoomkidspalakkad.com/uploads/1/3/1/4/131406985/2758958.pdf
    • http://files.joshlevinsonphoto.com/uploads/1/3/0/7/130775071/meturejejud.pdf
    • https://cdn.shopify.com/s/files/1/0429/9862/8501/files/zivaxawa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4864/0418/files/riwarokidavonidedomerumuw.pdf
    • https://cdn.shopify.com/s/files/1/0429/8443/9971/files/pemanimifelibazale.pdf
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/45850000730.pdf
    • https://cdn.shopify.com/s/files/1/0435/5116/2517/files/conceptual_physical_science_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/4193/7818/files/53537081162.pdf
    • https://cdn.shopify.com/s/files/1/0434/1504/4252/files/fizefegelidakijel.pdf
    • https://cdn.shopify.com/s/files/1/0432/3583/6072/files/xadizevik.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53940391871.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81603963226.pdf
    • https://cdn.shopify.com/s/files/1/0429/7608/4117/files/zogutifojojiw.pdf
    • https://cdn.shopify.com/s/files/1/0435/3448/3616/files/80386117331.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_off00005e04.bin
1c4966778790514834606256d6cd13612856deefc9ee5cd7409debdba0f5cac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E04 5748 bytes
font_01_sfnt_off00007178.bin
39326cc23e1d0f1a4b7b5a36df19b7c6f21423d6f5112a72748febfc1aaaddec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7178 10448 bytes

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