Malicious PDF — malware analysis report

Static analysis result for SHA-256 867f0a0f682f86c8…

MALICIOUS

PDF

55.3 KB Created: 2020-07-19 04:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0977e8da2d8e229ae41a0716dbd30a11 SHA-1: 64384e39b930633ca8613cc1c6be461f5cc92315 SHA-256: 867f0a0f682f86c848cf0b200e08ca371ba52e2da1601ca3184e5dab1ff8088c
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, identified as a link farm, with a critical heuristic firing for linking to known malicious redirector infrastructure. The primary malicious URL identified is ttraff.ru, which is used in conjunction with a search keyword related to organ transplant laws. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO-optimized PDFs for link farms. The ML classifier also strongly indicated maliciousness.

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/wb?keyword=ley%20de%20trasplante%20de%20organos%20argentina%20pdf
    • http://files.sprinkledco.com/uploads/1/3/0/7/130738765/bufosezim.pdf
    • http://files.thoughtfulduck.com/uploads/1/3/0/9/130969655/82d14.pdf
    • http://files.k-millar.com/uploads/1/3/0/7/130775174/fuwokod.pdf
    • https://cdn.shopify.com/s/files/1/0433/9138/5758/files/55963217942.pdf
    • https://cdn.shopify.com/s/files/1/0432/1384/8733/files/futumonuxasenopudufepo.pdf
    • https://cdn.shopify.com/s/files/1/0434/8212/0357/files/seloke.pdf
    • https://cdn.shopify.com/s/files/1/0432/6142/7876/files/luxonitezupisimef.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13879903487.pdf
    • https://gavilot137689634.files.wordpress.com/2020/07/68266745556.pdf
    • https://mugixunolaka.files.wordpress.com/2020/06/fimatodidi.pdf
    • https://vosorafumen.files.wordpress.com/2020/07/88121220288.pdf
    • https://jepupugewaka.files.wordpress.com/2020/07/zakojexugitu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4749/files/21767604859.pdf
    • https://cdn.shopify.com/s/files/1/0433/1637/9816/files/99590836247.pdf
    • https://cdn.shopify.com/s/files/1/0434/1058/7800/files/45442184577.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/wozuvefamud.pdf
    • https://cdn.shopify.com/s/files/1/0431/3740/0999/files/mikenota.pdf
    • https://cdn.shopify.com/s/files/1/0431/6558/1468/files/77070560697.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13578549785.pdf
    • https://cdn.shopify.com/s/files/1/0429/7257/7946/files/49511565375.pdf
    • https://cdn.shopify.com/s/files/1/0430/8336/6551/files/10011092871.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bijalikupuxamimidesedol.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_off00009791.bin
a44dd59bfa42a650ddbd0991ad7279398ae4e321485dd283a971d26b6364e956		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9791 5040 bytes
font_01_sfnt_off0000a8d0.bin
c717822026ad8795a1be10da7cdde3db62fbfc0f5e47c1e29962c8778a467117		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8D0 11296 bytes

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