Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48257baf002f458…

MALICIOUS

PDF

40.7 KB Created: 2020-08-01 12:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6ab08112b95499295fa362d0f9701c8 SHA-1: 7a95c0b19bd14e9ba8a0c916a30bd64f8a0dc1b1 SHA-256: a48257baf002f45801a59c58ee9341c4e2950d8acba73ae495d7bf22ae95517f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to what appears to be a link farm designed for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination of the attack. The document body, though heavily obfuscated, contains text related to 'myspanishlab answer key pdf', suggesting a lure to trick users into clicking malicious links under the guise of academic material. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/pify?keyword=myspanishlab+answer+key+pdf
    • http://files.sciencebeautygal.com/uploads/1/3/0/7/130775518/gudewiwisuzew.pdf
    • http://files.lehmanathleticboosterclub.com/uploads/1/3/2/6/132683330/4858914.pdf
    • http://files.bloomfieldhillsskiteam.com/uploads/1/3/0/7/130776728/429f9498f.pdf
    • http://files.washnword.com/uploads/1/3/0/8/130874154/rafizetenuvaso_xerekawal.pdf
    • http://files.pelsonfamily.com/uploads/1/3/0/8/130873791/67bd745f071e704.pdf
    • https://cdn.shopify.com/s/files/1/0436/8017/0137/files/vilumaxarite.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0503/files/86358608285.pdf
    • https://cdn.shopify.com/s/files/1/0437/1965/5579/files/chemistry_chang_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/2536/7194/files/43397523821.pdf
    • https://cdn.shopify.com/s/files/1/0430/1645/4305/files/remit_to_address.pdf
    • https://cdn.shopify.com/s/files/1/0433/1339/7924/files/34136268797.pdf
    • https://cdn.shopify.com/s/files/1/0434/7228/9944/files/92077592994.pdf
    • https://cdn.shopify.com/s/files/1/0435/7183/9135/files/hotmail_attachment_limit.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/risut.pdf
    • https://cdn.shopify.com/s/files/1/0437/5894/4405/files/mexinatepabogigo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7646/0448/files/jisazuxe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053f0.bin
6e3f23eabfd0b52a577b9fda61f30e58c6fb6318ce8f06d0a20b367512d7f319		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53F0 5132 bytes
font_01_sfnt_off00006553.bin
fa83cbb779b941c0a5737ecff3d18796bd85564b4bb23dc3c84699910552daf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6553 10144 bytes
font_02_sfnt_off00008801.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8801 4324 bytes

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