Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa443b209df3bb4…

MALICIOUS

PDF

38.9 KB Created: 2020-08-19 13:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4775b4b83ed9a00579ecfa3c8dad8e2 SHA-1: e34c93013e0b75e228854d937470539459cac931 SHA-256: daa443b209df3bb4312233211081f62017dd7afd020665345bb07d7323e9164c
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, functioning as a link farm. One of these URLs, https://ttraff.ru/pify?keyword=anova+test+tutorial+pdf, is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and contains the same URLs, reinforcing the link farm and redirection attack pattern.

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=anova+test+tutorial+pdf
    • http://files.silverfernflag.org/uploads/1/3/1/4/131408183/3544900.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/figokinobofenuxozazigesu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5150/8131/files/blavatsky_secret_doctrine_vol_4.pdf
    • https://cdn.shopify.com/s/files/1/0432/4347/1008/files/wear_characteristics_of_metals.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/loxigisegi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3262/4797/files/takizaxita.pdf
    • https://cdn.shopify.com/s/files/1/0435/2232/6680/files/designing_amplifier_circuits.pdf
    • https://cdn.shopify.com/s/files/1/0431/9923/4203/files/b_tech_cosmetics_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0430/3493/5447/files/32434743451.pdf
    • https://cdn.shopify.com/s/files/1/0429/9456/5271/files/28775552814.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_off00005afa.bin
715bb0caed6394ff650e7e740a849f2c5911de8b301c09b44ad03706133edaa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AFA 5084 bytes
font_01_sfnt_off00006c59.bin
02712eda935ebb637a45abdab24cf0811008950062036d32fc9dbb85bec93ff9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C59 10420 bytes

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