Malicious PDF — malware analysis report

Static analysis result for SHA-256 86990d694fc19841…

MALICIOUS

PDF

98.7 KB Created: 2020-08-07 08:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e827b05532cd7b74dde5458c6003a3f4 SHA-1: 477ca73d4d189276e8dbcf79c95cc895f949d8b8 SHA-256: 86990d694fc19841fe9ce7df6f78f712b0c16c32f97f56f8b46df3a82622e6ed
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a large number of external links. One of these links, 'https://ttraff.ru/pify?keyword=alberto+caeiro+pdf', is identified as a known malicious redirector. The document body appears to be heavily obfuscated or corrupted, but the presence of the malicious URL and the heuristic firings strongly suggest 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=alberto+caeiro+pdf
    • http://files.thisismayfield.com/uploads/1/3/0/7/130776861/xebenov.pdf
    • http://xabuz.religionandanimals.org/uploads/1/3/1/4/131453247/350229182c.pdf
    • http://files.4riverscentercbd.com/uploads/1/3/0/7/130776162/c9d5d9d.pdf
    • http://files.othersideofeverything.com/uploads/1/3/1/6/131606690/biwigapo-ridezukitubudox-dowin-solonexe.pdf
    • http://files.byleyvillagehallcheshire.co.uk/uploads/1/3/1/4/131454317/vemudibudego.pdf
    • https://cdn.shopify.com/s/files/1/0437/7955/5486/files/79971825589.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4270/files/jidus.pdf
    • https://cdn.shopify.com/s/files/1/0434/9716/0866/files/dumoxapel.pdf
    • https://cdn.shopify.com/s/files/1/0437/3102/6071/files/tikazojodovomagukidezo.pdf
    • https://cdn.shopify.com/s/files/1/0437/3735/0305/files/fuvamajafodud.pdf
    • https://cdn.shopify.com/s/files/1/0433/1618/3205/files/meparipe.pdf
    • https://cdn.shopify.com/s/files/1/0428/3550/9415/files/84528436032.pdf
    • https://cdn.shopify.com/s/files/1/0440/4117/5190/files/mexogopagonum.pdf
    • https://cdn.shopify.com/s/files/1/0436/9501/4056/files/54432995459.pdf
    • https://cdn.shopify.com/s/files/1/0433/1382/3909/files/37587204667.pdf
    • https://cdn.shopify.com/s/files/1/0433/4275/8053/files/wifaweribow.pdf
    • https://cdn.shopify.com/s/files/1/0438/8497/0139/files/sibuvetedeta.pdf
    • https://cdn.shopify.com/s/files/1/0428/6647/5174/files/67291922590.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_off000146a0.bin
7f92e04c00aa773b3ed7ecdefe8a0202b41ff8f4f584613da4f1cf16050960e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146A0 5100 bytes
font_01_sfnt_off00015805.bin
557e07b07d81f4c1696bde2b2503bccbb125addb78b6aef1a78f07dde670a4ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15805 11176 bytes

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