Malicious PDF — malware analysis report

Static analysis result for SHA-256 77193836294179c0…

MALICIOUS

PDF

55.3 KB Created: 2020-08-07 22:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1cc964de4a8440d639332b49494e4ee SHA-1: 7d371a00b330d43a37eb6fb2389488399fe02852 SHA-256: 77193836294179c0050632fd5da38c2632aaa9dec82922139be3b971c697c7be
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though obfuscated, contains URLs that are likely part of a link farm designed to improve search engine ranking for malicious sites. This suggests an attempt to drive traffic to potentially harmful 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=tv+antenna+installation+guide+pdf
    • http://files.chseducationfoundation.org/uploads/1/3/0/8/130874108/5045386.pdf
    • http://tufokus.nathanddavis.com/uploads/1/3/2/7/132712615/9825107.pdf
    • http://megamo.cranstoneastsoccer.com/uploads/1/3/2/6/132696414/dovusujibop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/5214/6586/files/tasilitesinalinefo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5616/8093/files/55415977561.pdf
    • https://cdn.shopify.com/s/files/1/0433/5068/7903/files/pivutupaxubawape.pdf
    • https://cdn.shopify.com/s/files/1/0431/6404/1373/files/gitanolivepi.pdf
    • https://cdn.shopify.com/s/files/1/0435/0646/6975/files/bergey_s_manual_of_systematic_bacteriology_volume_3_the_firmicutes.pdf
    • https://cdn.shopify.com/s/files/1/0432/6516/3422/files/33152141594.pdf
    • https://cdn.shopify.com/s/files/1/0430/7540/3929/files/topuni.pdf
    • https://cdn.shopify.com/s/files/1/0429/2853/7753/files/zijozezosevovagowes.pdf
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/9415144969.pdf
    • https://cdn.shopify.com/s/files/1/0429/7362/6524/files/15349513980.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9345/files/mewowegofagevubamexigosom.pdf
    • https://cdn.shopify.com/s/files/1/0430/7946/7162/files/nln_exam_study_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008c3d.bin
21d9debb28a7abf18115c67ccbd4a39f306ae076697cccbb6a24afcb76a5f566		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C3D 5004 bytes
font_01_sfnt_off00009d5c.bin
5f2215565b80c16a4608d08546629772121d23d058db04a4c5fcff29f09a35dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D5C 10060 bytes
font_02_sfnt_off0000bfd9.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD9 4324 bytes

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