Malicious PDF — malware analysis report

Static analysis result for SHA-256 2361994e49139f27…

MALICIOUS

PDF

49.8 KB Created: 2020-08-12 23:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 331a77acdb1d950676704eeb2fa0b07b SHA-1: 2d36280a10f28b026249d3bd27d13e69c035d198 SHA-256: 2361994e49139f27bc8749b3584c85e3b6164e94fa3381bfa95f251f4f2ff713
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, 'https://ttraff.ru/pify?keyword=abdominal+pain+approach+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. No scripts were extracted from this sample.

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=abdominal+pain+approach+pdf
    • http://files.littletwinkleacademy.org/uploads/1/3/1/4/131453733/aa590908.pdf
    • http://files.straitsobserver.com/uploads/1/3/1/4/131408899/3569057.pdf
    • http://duzopejes.fiftyshadeslove.com/uploads/1/3/0/9/130969332/regibubizoxam.pdf
    • http://files.lblumber.com/uploads/1/3/1/4/131409200/bawufipex.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/texojorigerusoxuduk.pdf
    • https://cdn.shopify.com/s/files/1/0437/1893/4677/files/ruwedovesinubofin.pdf
    • https://cdn.shopify.com/s/files/1/0440/5903/3752/files/selusovagesitugexupig.pdf
    • https://cdn.shopify.com/s/files/1/0431/8396/4324/files/dawexovuxidabarudikan.pdf
    • https://cdn.shopify.com/s/files/1/0434/3801/4616/files/sovojidizisetokosepazumor.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3971/files/minecraft_sea_lantern.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1146/files/spanish_english_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/7865/5903/files/19988680951.pdf
    • https://cdn.shopify.com/s/files/1/0434/0318/2231/files/naxerijopasasumom.pdf
    • https://cdn.shopify.com/s/files/1/0430/6341/0845/files/menosejab.pdf
    • https://cdn.shopify.com/s/files/1/0440/7400/8726/files/16184933889.pdf
    • https://cdn.shopify.com/s/files/1/0432/4789/4683/files/19752617700.pdf
    • https://cdn.shopify.com/s/files/1/0429/6101/0842/files/88283285830.pdf
    • https://cdn.shopify.com/s/files/1/0429/7228/3033/files/14528335675.pdf
    • https://cdn.shopify.com/s/files/1/0440/7872/7318/files/cancer_cervicouterino_tratamiento.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078b1.bin
627a29111dddc35d9722ee4e6eddb91b9b740c20ac745b3f3a509a62455e94bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78B1 4936 bytes
font_01_sfnt_off0000892d.bin
f6672f4e143bd10d7113c99b07762c10b6c7c39d89dd6b0c8ac0089a6967e381		 pdf-font-stream PDF embedded font (sfnt) at offset 0x892D 10016 bytes
font_02_sfnt_off0000ab61.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB61 4324 bytes

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