Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dea12f03c1e68d1…

MALICIOUS

PDF

34.0 KB Created: 2020-08-08 18:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 767dfd6eeab7fb5e2ee355a340c6f4d5 SHA-1: f867acf89a476b10359b5ea6445e40ef1171a956 SHA-256: 0dea12f03c1e68d1f6df14009b62ce8d90a9c9c2c3c01c8e60fb326c1fcdb4cf
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=possessive+adjective+pronouns+exercises+pdf'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external PDF links, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded links and redirector suggest a malicious intent to lead users to harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=possessive+adjective+pronouns+exercises+pdf
    • http://files.jaeceeraeofsunshine.org/uploads/1/3/0/7/130776327/gotuzu_nenumupobav.pdf
    • http://files.boysandgirlsclubofpembroke.org/uploads/1/3/1/4/131437236/fofonubipexujuv-sasemumo-xaditisoroga-wufoxoxataxo.pdf
    • http://files.jbmconsultants.org/uploads/1/3/1/3/131379622/2693478.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7765/4942/files/dupibafopobijosuforuki.pdf
    • https://cdn.shopify.com/s/files/1/0429/9941/4947/files/fepatopigupixokudefu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7208/5406/files/jutupitamu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6905/4886/files/62203227218.pdf
    • https://cdn.shopify.com/s/files/1/0434/8382/4294/files/wafebubutemenagofiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/6628/5480/files/wefogivefotebal.pdf
    • https://cdn.shopify.com/s/files/1/0435/3274/6906/files/80450317935.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/bajadataduneras.pdf
    • https://cdn.shopify.com/s/files/1/0440/8950/7990/files/arduino_mega_dimensions.pdf
    • https://cdn.shopify.com/s/files/1/0439/1701/7243/files/zufepesotepu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6887/5157/files/nodazo.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000461a.bin
76666884224e45f5793450484718c797bd9a23f437e30381ad83b279ecc0c3d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x461A 5324 bytes
font_01_sfnt_off0000585d.bin
433b45e7530f52906ce5046ea8ae1c3244d9ba78c37ce8ad78c7b4aa6fa6f5ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x585D 10068 bytes

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