Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f9d53b366034af…

MALICIOUS

PDF

40.8 KB Created: 2020-08-19 00:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f594f3414035c81b77a9eb014d130b47 SHA-1: c1dd402cfff0274f5fce8854f33699bef4384bf5 SHA-256: c1f9d53b366034af854115f0cfe5181d3fb7a7b14a6775a762e702891bea269d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.com) known to host malicious content. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL https://ttraff.com/pify?keyword=karyotype+matching+worksheet, suggesting a lure related to a worksheet. The presence of numerous Shopify-hosted PDFs indicates an attempt to blend in with legitimate content while distributing malicious links.

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=karyotype+matching+worksheet
    • http://files.rockymountainjackpotshowseries.com/uploads/1/3/1/0/131070112/da88b34310b9.pdf
    • http://bixisoja.thecurrencymatrix.com/uploads/1/3/0/7/130776827/gutuguzewaj.pdf
    • http://files.sparklebykelly.com/uploads/1/3/2/3/132303315/792d8.pdf
    • http://vazil.2017.taiwanpianofestival.com/uploads/1/3/1/4/131483167/7718486.pdf
    • http://files.dunmow-urc.org/uploads/1/3/1/4/131483025/382ed20edad.pdf
    • https://cdn.shopify.com/s/files/1/0434/3857/1670/files/61501844403.pdf
    • https://cdn.shopify.com/s/files/1/0432/4114/4483/files/71041684869.pdf
    • https://cdn.shopify.com/s/files/1/0429/1896/9507/files/29191813109.pdf
    • https://cdn.shopify.com/s/files/1/0433/3387/7914/files/88708180619.pdf
    • https://cdn.shopify.com/s/files/1/0427/9851/4343/files/mamemufevejozezota.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7248/files/towirol.pdf
    • https://cdn.shopify.com/s/files/1/0429/1775/7095/files/periodo_arcaico_superior.pdf
    • https://cdn.shopify.com/s/files/1/0431/1721/5905/files/94107007274.pdf
    • https://cdn.shopify.com/s/files/1/0435/5984/6051/files/chahun_main_ya_na_female_version.pdf
    • https://cdn.shopify.com/s/files/1/0437/9528/4130/files/zujetixotubebegalad.pdf
    • https://cdn.shopify.com/s/files/1/0432/0195/3952/files/vatub.pdf
    • https://cdn.shopify.com/s/files/1/0428/6975/1967/files/6725564026.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_off00006253.bin
6ca6c9984607cd08902d12dc640bb9c6e902b34753658839f8c2a89f12753a03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6253 5540 bytes
font_01_sfnt_off0000752a.bin
f1478286621cfdc92396ae96e4801b6ec707a46d9314cecda779b34feccc42c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x752A 9772 bytes

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