Malicious PDF — malware analysis report

Static analysis result for SHA-256 85cf917db901f350…

MALICIOUS

PDF

51.0 KB Created: 2020-08-05 17:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37674c9490ade7f9127b7e9c1cb2087b SHA-1: f6de31ab44373c7cf88a0b7eed775bd3632f7ac4 SHA-256: 85cf917db901f350215be645f771bb4e83a5d2d4804b0bdf8ec7eaaae5b953d6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=reformas+borbonicas+en+america+pdf'. Additionally, it features a PDF link farm heuristic, indicating a large number of external links, with 'https://cdn.shopify.com/s/files/1/0431/2891/4074/files/21058187868.pdf' being a prominent example. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the redirector URL and text related to 'reformas borbonicas en america pdf', suggesting a lure for users interested in that topic.

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=reformas+borbonicas+en+america+pdf
    • http://files.sharingserenity.co/uploads/1/3/0/9/130969989/golevazupu-geris-tujodamofivewav-kogupa.pdf
    • http://files.marziaclinic.si/uploads/1/3/0/7/130739163/a1bf7d06add35.pdf
    • http://files.valeriesplayhouse.com/uploads/1/3/0/7/130739024/kipanulemi-torarojapokesa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4074/files/21058187868.pdf
    • https://cdn.shopify.com/s/files/1/0438/1189/7504/files/lorepovu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4027/6642/files/jamabivavuxuvenoziwitu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5238/3907/files/dakatugogosasepogiwol.pdf
    • https://cdn.shopify.com/s/files/1/0432/2328/5928/files/wosodapozafulajafe.pdf
    • https://cdn.shopify.com/s/files/1/0429/5481/7690/files/56404707721.pdf
    • https://cdn.shopify.com/s/files/1/0436/2466/1154/files/ccna_data_center_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0435/4742/6975/files/53419742200.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2290/files/54326796270.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9354/files/tawadamezuxepone.pdf
    • https://cdn.shopify.com/s/files/1/0437/8722/3198/files/namojugedapiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/4238/1725/files/california_residential_purchase_agreement_2017.pdf
    • https://cdn.shopify.com/s/files/1/0435/1338/1028/files/78383645582.pdf
    • https://cdn.shopify.com/s/files/1/0432/7197/9172/files/dependency_injection_c.pdf
    • https://cdn.shopify.com/s/files/1/0431/4457/7178/files/sasivupivimotufobuxevu.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_off00008560.bin
99452436948df9996acead2485df5a745a5583edc99194cc20fef505c28893b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8560 5416 bytes
font_01_sfnt_off000097b2.bin
1f03da782f5d61b3e5f3bc00080103c49e031fe1ac19f7d72d733ac4f3f5c6d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97B2 11400 bytes

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