Malicious PDF — malware analysis report

Static analysis result for SHA-256 f79f3efca1c48800…

MALICIOUS

PDF

50.3 KB Created: 2020-07-30 15:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6d0f3639c8eab89d79930f5c1da5f15 SHA-1: 183f5ffc364f3bba4b8a182bac61633e147955ba SHA-256: f79f3efca1c488009a54dd306106c07d248886a55cb3556c72a34f1e760cc365
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, identified as a PDF link farm, pointing to various Shopify-hosted PDF files. The primary malicious indicator is a link to a redirector on ttraff.ru, which is flagged as malicious. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and appears to be junk data, but the presence of the SEO link farm and the malicious redirector suggests a phishing or malware distribution attempt.

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=aerospace+engineering+gate+syllabus+pdf
    • http://files.faejournals.com/uploads/1/3/0/7/130739544/6192208.pdf
    • http://files.wildrootlife.com/uploads/1/3/1/4/131407080/5310863.pdf
    • http://files.relaxationretreathealthbenefits.com/uploads/1/3/1/3/131381237/vupufuxun.pdf
    • https://cdn.shopify.com/s/files/1/0431/5709/4559/files/13174287441.pdf
    • https://cdn.shopify.com/s/files/1/0431/8711/0037/files/jerekusufaxodizazoven.pdf
    • https://cdn.shopify.com/s/files/1/0431/1403/7397/files/zokabimijunetixopewigoxex.pdf
    • https://cdn.shopify.com/s/files/1/0434/3631/0678/files/tidolevugorerutozazak.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/zijezaburunapunejefo.pdf
    • https://cdn.shopify.com/s/files/1/0438/1461/7250/files/dubopoxu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6009/1287/files/lanukijugekizegulebovudaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/8350/5562/files/fixifilagugav.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupesuditijativerawepafu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3182/1473/files/lijusu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5385/8472/files/vejivalazazusemo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9483/files/binuxesokudese.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/31950606525.pdf
    • https://cdn.shopify.com/s/files/1/0435/9313/8333/files/zirij.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_off000084b7.bin
dc2a3547b20701362751feeda3c2b539e1de05f8fbf60cd7f022037ee4c21758		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84B7 5436 bytes
font_01_sfnt_off00009741.bin
a905d56d8c23fbd505217bfdf367666c7972d3d80df609e4c6bba288b873a337		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9741 10636 bytes

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