Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1ac33517308b2f…

MALICIOUS

PDF

48.2 KB Created: 2020-07-31 09:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b2dccfc10fc2c1e46cc2e710eebef31 SHA-1: e9a70ea09b063742d90e4c7083abdfe36789ec79 SHA-256: 4c1ac33517308b2f3173d835e3dfab81177bab88f1357d3fb0221ca348616787
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary URL, 'https://ttraff.ru/pify?keyword=simple+spoken+english+grammar+pdf', is flagged as a malicious redirector. Another heuristic identified a PDF link farm, suggesting an attempt to distribute or obscure malicious links. The ML classifier also strongly indicated maliciousness.

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=simple+spoken+english+grammar+pdf
    • http://files.thedayindayout.com/uploads/1/3/1/8/131856212/foguvujexaweri.pdf
    • http://files.michaelgibbinsracing.com/uploads/1/3/1/4/131437848/7729351.pdf
    • http://files.kunsthallekleinbasel.com/uploads/1/3/2/7/132740445/xusaxewepe_xirikozovalu_mulafowuxedowo_pesiw.pdf
    • http://files.pmmusp.com/uploads/1/3/1/0/131070374/dajekib.pdf
    • http://files.symbolicartcenter.com/uploads/1/3/1/4/131453241/pikazipeg-fixisupenefomiz.pdf
    • https://cdn.shopify.com/s/files/1/0435/3536/8346/files/busodoliwefelosava.pdf
    • https://cdn.shopify.com/s/files/1/0437/1054/6071/files/timowedazumekefajiwibanan.pdf
    • https://cdn.shopify.com/s/files/1/0431/8789/6488/files/79080928792.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gifowugebivagobawogun.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/dediwe.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/43403424955.pdf
    • https://cdn.shopify.com/s/files/1/0437/9770/8957/files/6636959687.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/10442363801.pdf
    • https://cdn.shopify.com/s/files/1/0431/6135/4389/files/rumexusarodudale.pdf
    • https://cdn.shopify.com/s/files/1/0434/1324/2005/files/novozada.pdf
    • https://cdn.shopify.com/s/files/1/0433/4118/5189/files/763975048.pdf
    • https://cdn.shopify.com/s/files/1/0436/7073/2950/files/44385656712.pdf
    • https://cdn.shopify.com/s/files/1/0432/0637/7632/files/7486999333.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_off00007ec0.bin
b3ea903c5ecb969a5b83a8f171966115455efef59e04e632fe41c30345581243		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC0 5332 bytes
font_01_sfnt_off000090a1.bin
02346ee5bc6c78299db28531e53f1081e8af335d4038c8c1ba52bb2c7850c90b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90A1 10068 bytes

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