Malicious PDF — malware analysis report

Static analysis result for SHA-256 89cca45cd35fec81…

MALICIOUS

PDF

41.6 KB Created: 2020-08-10 05:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37ae8f80214342dcaf39e31492302a73 SHA-1: 596d00486bf870269651228e424457d7d93cb981 SHA-256: 89cca45cd35fec81699ec8cb43068a6c4d9d2c9461acecfa5e85f1db6afee918
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits a PDF link farm behavior, embedding numerous external links, many hosted on Shopify. The primary malicious link is 'https://ttraff.ru/pify?keyword=branches+of+financial+accounting+pdf', which likely serves as a lure to redirect users to a malicious site. 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=branches+of+financial+accounting+pdf
    • http://files.batrssocal.com/uploads/1/3/1/3/131384789/vipibifoxoteroxu.pdf
    • http://files.mountainlakewinery.com/uploads/1/3/0/8/130874411/mirezeworedu.pdf
    • http://budoz.antigonekoutalieri.com/uploads/1/3/1/6/131636948/zevus-donivus-lupeze.pdf
    • http://zinadesi.dragonflycoulee.com/uploads/1/3/2/6/132681670/27a4b49.pdf
    • http://files.engineersinmedicine.com/uploads/1/3/1/4/131452997/0eb80d43fb1fe9d.pdf
    • https://cdn.shopify.com/s/files/1/0428/1889/6038/files/sukotogob.pdf
    • https://cdn.shopify.com/s/files/1/0429/7113/6154/files/52618195584.pdf
    • https://cdn.shopify.com/s/files/1/0437/4292/0869/files/dosagixesavibaraganin.pdf
    • https://cdn.shopify.com/s/files/1/0437/5976/3617/files/deficiencia_de_vitamina_b12_sintomas_neurologicos.pdf
    • https://cdn.shopify.com/s/files/1/0429/5327/7603/files/vogupamara.pdf
    • https://cdn.shopify.com/s/files/1/0429/4947/6518/files/dodufujo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6200/1821/files/judubiropidu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5461/2123/files/kisewalugatige.pdf
    • https://cdn.shopify.com/s/files/1/0430/0596/8537/files/dagugexuter.pdf
    • https://cdn.shopify.com/s/files/1/0432/3193/6674/files/11430272290.pdf
    • https://cdn.shopify.com/s/files/1/0431/7727/9652/files/liluwewerutebubuxim.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/tagagaxileluxuvogesetulan.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_off00006710.bin
e171fba401c808075d4b5b3d9c4106aa5681253cc4a7f0cda25ac23a2d1e96ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6710 5468 bytes
font_01_sfnt_off000079a3.bin
2d4a7c98e483dfb85d0a8a3bfbfa41392784277610199d5163208383ad96d765		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79A3 9244 bytes

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