Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f577370f43312b9…

MALICIOUS

PDF

59.8 KB Created: 2020-08-11 02:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07d73b19108f18d868197e5841cc96c9 SHA-1: 2e9e08de80401bf3aaf1cc0754a4750fe0a0a169 SHA-256: 0f577370f43312b94830bb38e574e3dc09a4eafd9f7ab870e7580812115c3b3d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external PDFs, many of which are hosted on domains associated with link farms or redirectors, such as ttraff.ru. The document body, though heavily obfuscated, contains a URL that mirrors the malicious redirector link. This suggests the primary purpose is to direct users to malicious infrastructure, likely for SEO spam or to serve further malicious content.

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=study+of+ultrastructure+and+morphological+classification+of+bacteria+pdf
    • http://dilarogik.leisuretravelsrilanka.com/uploads/1/3/1/3/131380005/6411364.pdf
    • http://kosuxi.upsidedowndimples.com/uploads/1/3/1/4/131482975/7982a.pdf
    • http://lofunudo.sacredsummitchocolate.com/uploads/1/3/2/8/132814930/gorivezorokid.pdf
    • http://nogigomoz.barrelrollnews.com/uploads/1/3/2/6/132681513/d65bced74e3.pdf
    • http://files.ondspotentertainmentandprinting.com/uploads/1/3/0/7/130776573/be69cb5b6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8646/2620/files/43117491721.pdf
    • https://cdn.shopify.com/s/files/1/0430/6993/1671/files/balancing_chemical_equations_examples_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/bafeleviziwokaxek.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3435/files/38058291484.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/bearing_tolerance_chart.pdf
    • https://cdn.shopify.com/s/files/1/0428/1905/9868/files/mathematics_worksheets_for_grade_8.pdf
    • https://cdn.shopify.com/s/files/1/0435/8003/1135/files/fezuxavesavivupanovovelej.pdf
    • https://cdn.shopify.com/s/files/1/0437/5989/4682/files/tapagejela.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/external_courts_esawebapp_e_payment_epaymentsearchframe.pdf
    • https://cdn.shopify.com/s/files/1/0434/1566/6840/files/mepininado.pdf
    • https://cdn.shopify.com/s/files/1/0437/6795/5605/files/46011920337.pdf
    • https://cdn.shopify.com/s/files/1/0431/2619/4336/files/zisexopamowim.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_off0000aa1c.bin
23f19e7b83408a487a21dd15bd7e338b4432852a68fb637d15390c4108f5d0ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA1C 5912 bytes
font_01_sfnt_off0000be0b.bin
dab3b344fb77a1f209de47d47245c6d6f421a9a2a6d0fb8d82f56873993c98b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE0B 10336 bytes

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