Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7889ca2e9ff16fc…

MALICIOUS

PDF

48.3 KB Created: 2020-08-06 07:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0f92679653ca02f5391332a80a7ac8f SHA-1: 32f2c78cbe290305d59195f5f58a5061e31c2fce SHA-256: f7889ca2e9ff16fc258defc43e5674791dc574037a105c8ee14bd463bf394f9f
152 Risk Score

Malware Insights

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

The PDF was flagged for containing links to known malicious redirector infrastructure, specifically `https://ttraff.com/pify?keyword=o+meio+ambiente+pdf`. It also exhibits characteristics of a PDF link farm, embedding numerous external links, with `https://cdn.shopify.com/s/files/1/0435/0276/4184/files/xoxukarukuso.pdf` being one of the first identified. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to lure users to harmful sites.

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=o+meio+ambiente+pdf
    • http://files.cooliecollection.com/uploads/1/3/0/7/130740065/lolosidi.pdf
    • http://files.virginiaasthmacoalition.org/uploads/1/3/1/1/131163684/5949820.pdf
    • http://files.mrscroninphysicalscience.com/uploads/1/3/1/3/131380847/41c67.pdf
    • https://cdn.shopify.com/s/files/1/0435/0276/4184/files/xoxukarukuso.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/xupotapim.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gubiwunezekubukezo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1698/5508/files/47502360821.pdf
    • https://cdn.shopify.com/s/files/1/0433/5026/1915/files/rafawufanometorebup.pdf
    • https://cdn.shopify.com/s/files/1/0434/2172/8918/files/hey_there_delilah_piano_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6849/files/85040683429.pdf
    • https://cdn.shopify.com/s/files/1/0432/9422/8630/files/laketarigos.pdf
    • https://cdn.shopify.com/s/files/1/0433/0936/7461/files/calculus_and_analytic_geometry_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46496449222.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/rojurejudixup.pdf
    • https://cdn.shopify.com/s/files/1/0437/1133/2503/files/dizigew.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_off00007cd6.bin
b1bc83cfd774bbd04995673a63a576b7340f1cdcf1fbf598bfa4b76b6d96393c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD6 5048 bytes
font_01_sfnt_off00008de8.bin
3b2b98cec406a69cb92f7322558f0bb17b50a56c8705ba4196d01d15f78e21ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DE8 12312 bytes