Malicious PDF — malware analysis report

Static analysis result for SHA-256 516d38839613678f…

MALICIOUS

PDF

59.8 KB Created: 2020-08-08 10:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 366bd69124209c0db2659811a6274d89 SHA-1: f7b5ccf35eb22298329474151429541dfad36b32 SHA-256: 516d38839613678fa05dda6272f5d71d3feb04aefb9bbc680db2a0f8b8673477
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector at `ttraff.cc`. The document body, though malformed, contains text related to a worksheet, suggesting a lure. The ML classifier strongly supports the malicious verdict. No scripts were extracted, limiting the analysis of specific payload delivery mechanisms.

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=causes+of+american+revolution+worksheet+pdf
    • http://masujufa.harmonythatmatters.com/uploads/1/3/2/3/132303410/pitosafepi.pdf
    • http://files.ginterrupted.org/uploads/1/3/0/7/130738814/2091192.pdf
    • http://files.hsvgac.com/uploads/1/3/1/4/131452826/fufepawoditugan_fikuk_lanuxena_lofoj.pdf
    • http://naruwawut.fairyringschool.org/uploads/1/3/1/3/131383483/kivij.pdf
    • https://cdn.shopify.com/s/files/1/0437/5497/9477/files/yasin_surah.pdf
    • https://cdn.shopify.com/s/files/1/0434/0760/5923/files/adulthood_rites_octavia_butler.pdf
    • https://cdn.shopify.com/s/files/1/0429/9417/2058/files/biwebo.pdf
    • https://cdn.shopify.com/s/files/1/0439/8913/9614/files/15983206110.pdf
    • https://cdn.shopify.com/s/files/1/0434/4040/6684/files/22520201004.pdf
    • https://cdn.shopify.com/s/files/1/0432/2079/5556/files/kitatanatumomu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3796/5986/files/adb_list_packages.pdf
    • https://cdn.shopify.com/s/files/1/0427/5086/9671/files/behavioural_neuroscience_breedlove.pdf
    • https://cdn.shopify.com/s/files/1/0430/3778/6265/files/33432931556.pdf
    • https://cdn.shopify.com/s/files/1/0439/4031/5294/files/2397587040.pdf
    • https://cdn.shopify.com/s/files/1/0432/2190/9662/files/texuwomaxa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/muzoguganava.pdf
    • https://cdn.shopify.com/s/files/1/0434/4443/7142/files/79513841169.pdf
    • https://cdn.shopify.com/s/files/1/0436/6693/1865/files/kohler_faucets_repair_manual.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_off0000ac3f.bin
bc33af3e39b8275a3c817a667ac7ab8f856a449f826d28608c684b5e4453923c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC3F 5516 bytes
font_01_sfnt_off0000bee4.bin
cdcae63c7ce8575be2e90f840276b95c43b4ab80658008762ccda9b72e1499c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE4 10192 bytes

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