Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3fc2428c3f0d55f…

MALICIOUS

PDF

36.7 KB Created: 2020-08-05 09:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 137ea71cafcbd48447054f9f65ff6823 SHA-1: 6f3c38d821b1b1fe13cc818164ecc0ac823b1990 SHA-256: c3fc2428c3f0d55fbe9a1b94492f3f32fe6e35b4c6817add4f23adb997e4cd4c
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains a critical link to a known malicious redirector. It also exhibits characteristics of a PDF SEO link farm, embedding numerous links to other PDFs, likely to manipulate search engine results and distribute malicious content. The primary malicious URL identified is https://ttraff.ru/pify?keyword=magisterium+5+la+torre+dorada+pdf+descargar+gratis.

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=magisterium+5+la+torre+dorada+pdf+descargar+gratis
    • http://files.spanish-expressions.com/uploads/1/3/2/6/132682070/1674864.pdf
    • http://files.djtechtalkonline.com/uploads/1/3/1/0/131070845/9936053.pdf
    • http://files.broadbeachestateinverloch.com/uploads/1/3/0/8/130815277/9f64538f1a1e6.pdf
    • http://files.theeventerinred.com/uploads/1/3/0/8/130874278/pogud-libizonesufik-nozaxazoso-mirufigumize.pdf
    • https://cdn.shopify.com/s/files/1/0435/7101/9935/files/kotos.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2175/files/vurajukerimesuzefagi.pdf
    • https://cdn.shopify.com/s/files/1/0438/1956/5216/files/5183551899.pdf
    • https://cdn.shopify.com/s/files/1/0428/9065/7951/files/27181091791.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kefemomorevogik.pdf
    • https://cdn.shopify.com/s/files/1/0436/9180/2777/files/35870187684.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3482/files/xewas.pdf
    • https://cdn.shopify.com/s/files/1/0433/8198/1347/files/69992020217.pdf
    • https://cdn.shopify.com/s/files/1/0430/6521/3079/files/mujawesa.pdf
    • https://cdn.shopify.com/s/files/1/0430/6970/2306/files/xufuxatuvonasiwow.pdf
    • https://cdn.shopify.com/s/files/1/0436/5392/2981/files/49785486284.pdf
    • https://cdn.shopify.com/s/files/1/0431/7829/5450/files/97297428311.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9483/files/37075445228.pdf
    • https://cdn.shopify.com/s/files/1/0429/1274/3580/files/60342126113.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_off00004de0.bin
b44dd667a6c687fa51c4b316a425e23a5ab447aa1155ba0f9e9c36b3b29c73d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DE0 5604 bytes
font_01_sfnt_off000060ed.bin
618ca57a5876fb091c8ee0b6d9bd29d51cc3c0602fdb795986b40cde9bbb23f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60ED 10640 bytes

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