Malicious PDF — malware analysis report

Static analysis result for SHA-256 82961ac584f6e24d…

MALICIOUS

PDF

45.6 KB Created: 2020-08-04 21:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbf275cab97124dc0b7059d48e754927 SHA-1: 2ad6cb31a20fb5c6f4f6b6fa56d7778c3dc1b47d SHA-256: 82961ac584f6e24dc1d0653972cb5ae0795044aa6ea77d7dc3e6ff656295b2ab
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though malformed, contains text suggesting a lure for a PDF download. The primary malicious link identified is https://ttraff.com/pify?keyword=functional+programming+in+c+enrico+buonanno+pdf+download, which likely leads to further malicious content. The presence of a large number of external PDF links suggests a link farm or SEO poisoning tactic.

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=functional+programming+in+c+enrico+buonanno+pdf+download
    • http://files.centeringprayerpensacola.com/uploads/1/3/1/4/131408415/631fd5a884900d0.pdf
    • http://files.lighthouseministriesworldwide.org/uploads/1/3/1/3/131379832/7514084.pdf
    • http://files.easw.net/uploads/1/3/2/7/132740214/labunikoxis.pdf
    • http://zemedat.ponciauparkbowls.com/uploads/1/3/1/8/131871980/lakitafab-nepupaxuzojog.pdf
    • http://files.perinatalechoimaging.com/uploads/1/3/2/8/132815359/65c7b33.pdf
    • https://cdn.shopify.com/s/files/1/0431/2354/0124/files/48865954089.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/tewepajifasizuj.pdf
    • https://cdn.shopify.com/s/files/1/0432/3901/4562/files/rigomebexuvoruputobala.pdf
    • https://cdn.shopify.com/s/files/1/0427/9071/5548/files/46691793564.pdf
    • https://cdn.shopify.com/s/files/1/0430/2897/1681/files/8002836056.pdf
    • https://cdn.shopify.com/s/files/1/0431/9540/0356/files/39861699216.pdf
    • https://cdn.shopify.com/s/files/1/0439/8543/6830/files/67504028718.pdf
    • https://cdn.shopify.com/s/files/1/0435/9543/2099/files/emoticon_rolling_eyes.pdf
    • https://cdn.shopify.com/s/files/1/0435/5804/3807/files/accuweather_dover_de.pdf
    • https://cdn.shopify.com/s/files/1/0430/8054/8503/files/bodukeruriruxanalegepi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7920/5013/files/94772825782.pdf
    • https://cdn.shopify.com/s/files/1/0431/1190/7488/files/woxurujusupototonozi.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_off000072e7.bin
69953bc0dc4fe01a8822debf52bc377cb12b4ac5f0b3e915307c4924c9535f46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72E7 5484 bytes
font_01_sfnt_off00008589.bin
ac07d4dc712967f2a7048db758284b4f9f0f62eb8ead35a6fe1871ba9b84a471		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8589 10316 bytes

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