Malicious PDF — malware analysis report

Static analysis result for SHA-256 70bebc64c808cf82…

MALICIOUS

PDF

42.7 KB Created: 2020-08-11 03:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffcb33c53c81166e996b58fac1191c5f SHA-1: 07cd14cc8e266d4c4e830d06cdb7c2b2868381b7 SHA-256: 70bebc64c808cf825d21d1be6053077d2d0a85159793f9aa69087d34725a3cdf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection strategy. One of the primary URLs, 'https://ttraff.com/pify?keyword=tube+digestif+des+insectes+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though partially garbled, contains the malicious URL and appears to be a 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.com/pify?keyword=tube+digestif+des+insectes+pdf
    • http://gulogebe.thelandscapestore.net/uploads/1/3/0/7/130739430/4420388.pdf
    • http://files.navslaborers.org/uploads/1/3/0/8/130814586/8448797.pdf
    • http://files.brpride.org/uploads/1/3/0/7/130775795/2630316.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4996/6998/files/jawokexanogovinizipepeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/0314/9462/files/59380834643.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9812/files/67035056778.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4465/files/fefosasugeromuviger.pdf
    • https://cdn.shopify.com/s/files/1/0437/0857/9993/files/3442956654.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5800/files/82833686414.pdf
    • https://cdn.shopify.com/s/files/1/0432/6755/5481/files/vugufiwabokigi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7571/4715/files/1394222017.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/jamobatonedunonukototej.pdf
    • https://cdn.shopify.com/s/files/1/0429/2280/3366/files/lovetufebo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kubogofire.pdf
    • https://cdn.shopify.com/s/files/1/0437/5881/3336/files/4073059049.pdf
    • https://cdn.shopify.com/s/files/1/0430/9726/0192/files/29286150892.pdf
    • https://cdn.shopify.com/s/files/1/0429/5403/1270/files/52263732096.pdf
    • https://cdn.shopify.com/s/files/1/0428/6713/0534/files/netepokixetoxafakojok.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000669e.bin
f0648aefbb7da6c08908737f99e713356ac0aff2787a3ace3df39b6c6eed8084		 pdf-font-stream PDF embedded font (sfnt) at offset 0x669E 5072 bytes
font_01_sfnt_off000077ed.bin
d82d67e608c7ab262cb255938220b29c08a2d90cbc9e5ac5ee6525675673c07d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77ED 11528 bytes

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