Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6753db594fa5d47…

MALICIOUS

PDF

42.9 KB Created: 2020-08-15 02:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f328c3c46c3d185af130e2984637e72 SHA-1: c239c37177fc76aac24ffbc880fd6a079cdc17bc SHA-256: a6753db594fa5d47000ac888f0ef9790fc7968afc8babf43e9c7899e576ed0a6
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. Another critical heuristic identified a large external PDF link farm, suggesting a tactic to manipulate search engine results or distribute content. The document body itself contains text related to 'Bully english 1- 5 answers' and the wkhtmltopdf application, which is unusual for a typical document. The presence of numerous links, including one to a malicious redirector, strongly suggests an attempt to lure users to malicious sites or to distribute further payloads.

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=bully+english+1-+5+answers
    • http://bikef.hananhafiz.com/uploads/1/3/1/3/131398091/vomevag-nenugefem-neregoxal.pdf
    • http://fopiguv.connectedrealities.com/uploads/1/3/1/4/131437089/kamevede.pdf
    • http://files.comicbooknoob.com/uploads/1/3/1/4/131408970/negekivur.pdf
    • http://files.uciwpthinkbig.com/uploads/1/3/0/7/130739598/a82c9c159a821.pdf
    • https://cdn.shopify.com/s/files/1/0431/5165/5076/files/37334967839.pdf
    • https://cdn.shopify.com/s/files/1/0433/4246/3126/files/859278927.pdf
    • https://cdn.shopify.com/s/files/1/0437/6454/7741/files/napudagexuweburugapu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3517/1738/files/46398659693.pdf
    • https://cdn.shopify.com/s/files/1/0430/6891/5863/files/denujosotiloxidanubofa.pdf
    • https://cdn.shopify.com/s/files/1/0451/7547/2279/files/linudabijuxobikikowafed.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8311/files/sugusulenifarubewoberexub.pdf
    • https://cdn.shopify.com/s/files/1/0437/1061/1605/files/pdf_to_word_converter_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/8561/7566/files/vudelodokevaka.pdf
    • https://cdn.shopify.com/s/files/1/0427/4785/5004/files/spider_solitaire_two_green_felt.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/64323379261.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_off00006898.bin
e19b29b9b51aba222717333998ea23421a78d40b828165fb3c9a1ff8d7d91bc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6898 5396 bytes
font_01_sfnt_off00007b13.bin
ab74f61b9dc2dea008900b46ceb9d38ecfe50a1a240e7d3ca37c2bfb7e5cae70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B13 10676 bytes

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