Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6bb9b0b8f46b8b4…

MALICIOUS

PDF

43.9 KB Created: 2020-08-06 12:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12f4e12a4c6a4706758b9ca9713913a0 SHA-1: f2396394f88f50bd31d6113a96c924ab95c319d2 SHA-256: f6bb9b0b8f46b8b4470f3eff9c46d4b9cacdc22dde4de6f21932f287530962d0
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a redirector link to ttraff.ru. The document body, though partially corrupted, contains text related to a 'libro agenda' and the malicious URL, suggesting a lure for users seeking free PDF downloads. The ML classifier strongly supports the malicious verdict.

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=libro+agenda+peque%25C3%25B1o+cerdo+capitalista+2020+pdf+gratis
    • http://files.non-disneyinternationaldubbingcredits.com/uploads/1/3/2/6/132681352/pofikesulifomup_porekurapala.pdf
    • http://files.oakleyboycott.com/uploads/1/3/0/7/130776861/c7884ab2cd93e4.pdf
    • http://files.twowaitinghearts.com/uploads/1/3/1/4/131453506/00ddf60d77476c.pdf
    • https://cdn.shopify.com/s/files/1/0437/6199/1841/files/93105097481.pdf
    • https://cdn.shopify.com/s/files/1/0430/2071/4137/files/24778998292.pdf
    • https://cdn.shopify.com/s/files/1/0431/6699/0498/files/wonaxiliwevag.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8710/files/923229711.pdf
    • https://cdn.shopify.com/s/files/1/0437/8044/0215/files/www_nod_321_com.pdf
    • https://cdn.shopify.com/s/files/1/0431/1180/9190/files/97656130488.pdf
    • https://cdn.shopify.com/s/files/1/0429/5147/5351/files/xizoxupokax.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/73138320724.pdf
    • https://cdn.shopify.com/s/files/1/0430/5515/3303/files/tojenuvu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2938/1791/files/falofolumolivile.pdf
    • https://cdn.shopify.com/s/files/1/0432/4848/4507/files/mebajamodid.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/56553305325.pdf
    • https://cdn.shopify.com/s/files/1/0433/3050/2806/files/petaliso.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_off000064dd.bin
7ac955768a82cc4c68b0ccc4413b3743f8c305ee0614b28af3584889ba567fd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x64DD 6016 bytes
font_01_sfnt_off0000791f.bin
4a855049e49c0b89a1a1a18afaafb58807cad1b8bd5cb61d8fb925e6d4576ef7
pdf-font-stream PDF embedded font (sfnt) at offset 0x791F 11960 bytes