Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c591b8dad854d57…

MALICIOUS

PDF

43.6 KB Created: 2020-08-17 08:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3551e023a392e84efaf4132b56aa46c3 SHA-1: 348f3f75f4516ca9d013e48e96ff092b6f333b4e SHA-256: 9c591b8dad854d572681754b3e79dc59034adf6808dc79423c234966fcab79b0
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to `https://ttraff.com/pify?keyword=feasibility+study+report+table+of+contents`. This URL is embedded within the document's body text, disguised as a report title. The document also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on `cdn.shopify.com`, likely to improve search engine ranking and obscure the malicious intent. The ML classifier 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=feasibility+study+report+table+of+contents
    • http://files.catereedphotography.com/uploads/1/3/1/4/131483235/8529443.pdf
    • http://files.olliatduke.org/uploads/1/3/0/7/130775063/tumituwirop.pdf
    • http://files.bettyjean.shop/uploads/1/3/2/6/132696113/lakaw.pdf
    • http://files.fustlerthefemalehustler.com/uploads/1/3/0/7/130739839/gaxiwoloxakutenuboj.pdf
    • https://cdn.shopify.com/s/files/1/0434/1825/5510/files/vuniso.pdf
    • https://cdn.shopify.com/s/files/1/0433/1136/6309/files/84050496772.pdf
    • https://cdn.shopify.com/s/files/1/0440/7810/4728/files/vidiguzavaruzijewa.pdf
    • https://cdn.shopify.com/s/files/1/0435/6793/9743/files/pesolebubawugiwapujuke.pdf
    • https://cdn.shopify.com/s/files/1/0438/1805/7885/files/28916958193.pdf
    • https://cdn.shopify.com/s/files/1/0438/1822/1728/files/604749099.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/88061198540.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/62141114198.pdf
    • https://cdn.shopify.com/s/files/1/0429/5655/4394/files/68744135334.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6411/files/3882134019.pdf
    • https://cdn.shopify.com/s/files/1/0437/9531/6896/files/ecmo_circuit_priming_guideline.pdf
    • https://cdn.shopify.com/s/files/1/0429/7919/7081/files/subaru_factory_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/5273/5391/files/95937326335.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_off000069fa.bin
f7721f72d4592c9e7311cdf16fa0e1373392f4c7f77d35e7ea897aeef5b26c27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69FA 5348 bytes
font_01_sfnt_off00007c2e.bin
7d446a1f922cce013dbee1b8bdd986352c8cda7ec2b7b652e272c21a4b8eca5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C2E 11124 bytes

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