Malicious PDF — malware analysis report

Static analysis result for SHA-256 44abbd66f8e06e2d…

MALICIOUS

PDF

46.6 KB Created: 2020-08-14 00:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da2ef259de1d51a2fc0129536e271a78 SHA-1: f8c8f5dda18ba4cf9d2f9e6361d0819622508808 SHA-256: 44abbd66f8e06e2d69bbfef4fe5e2ade544a2a3db528b82ea69fee1c1948bebf
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/pify?keyword=cakephp+2.+x+date+format'. Additionally, it exhibits a PDF link farm behavior with numerous links, many hosted on cdn.shopify.com. The ML classifier also strongly indicated maliciousness. The document body contains the malicious URL and several benign-looking URLs, likely as part of the link farm. No scripts were extracted, but the primary intent appears to be redirecting users to malicious infrastructure.

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.cc/pify?keyword=cakephp+2.+x+date+format
    • http://files.alexanderswoodfloors.com/uploads/1/3/0/7/130739533/8f6b463ca3f.pdf
    • http://files.come2faith.net/uploads/1/3/0/9/130969545/tavip-rugifudidebutir-baxupiguxom-sikuwujaraxun.pdf
    • http://files.steelpassport.com/uploads/1/3/0/8/130874012/nafutagusukan.pdf
    • http://files.sdhabitat.org/uploads/1/3/1/3/131398573/73585b4324.pdf
    • https://cdn.shopify.com/s/files/1/0437/7162/5621/files/plantas_endemicas_de_yucatan.pdf
    • https://cdn.shopify.com/s/files/1/0437/3096/0549/files/rubun.pdf
    • https://cdn.shopify.com/s/files/1/0432/5684/0350/files/87268451439.pdf
    • https://cdn.shopify.com/s/files/1/0430/6803/1143/files/juzepejewikibomevoso.pdf
    • https://cdn.shopify.com/s/files/1/0430/3536/1442/files/90562368249.pdf
    • https://cdn.shopify.com/s/files/1/0439/1400/2600/files/insurable_and_uninsurable_risks.pdf
    • https://cdn.shopify.com/s/files/1/0430/5112/2842/files/sowokuveroperilabofaj.pdf
    • https://cdn.shopify.com/s/files/1/0449/4196/7528/files/benefits_of_effective_communication_in_an_organization.pdf
    • https://cdn.shopify.com/s/files/1/0435/9654/6216/files/tugiranotarewufuwajed.pdf
    • https://cdn.shopify.com/s/files/1/0429/7113/6154/files/97541286638.pdf
    • https://cdn.shopify.com/s/files/1/0435/5905/9615/files/19720224194.pdf
    • https://cdn.shopify.com/s/files/1/0432/2449/8333/files/melokepame.pdf
    • https://cdn.shopify.com/s/files/1/0431/7803/3313/files/67383406968.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_off0000784a.bin
ab413b87b1592de3f4e4c97e04f17f01407aba33a76f6e1941825047d706b5f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x784A 5272 bytes
font_01_sfnt_off00008a27.bin
5fb7fd548422ecd5f07e49cd6136e07683a91c162deb45e13c5596b36dca0047		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A27 10240 bytes

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