Malicious PDF — malware analysis report

Static analysis result for SHA-256 682dce0b0c557f39…

MALICIOUS

PDF

43.5 KB Created: 2020-08-14 20:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83db3dc1c1acfa09aa6801855ae0a16f SHA-1: 8753a859afe4798cab79f2e59e3b6249c4857431 SHA-256: 682dce0b0c557f39c97e41b76ea5de8677a948ed7604d2341979b97b41719d09
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains text related to 'income tax basic concept pdf' and includes the malicious URL, suggesting a lure to a site that likely hosts further malicious content or phishing attempts.

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/wb?keyword=income%20tax%20basic%20concept%20pdf
    • http://files.heathergeoffrey.com/uploads/1/3/0/9/130969085/biriv.pdf
    • http://vofaliziv.counter-recruit.org/uploads/1/3/1/8/131871980/gefepumerozujozukugu.pdf
    • http://files.soulauthority.net/uploads/1/3/0/7/130739258/kutejogukipif_xejefo_zosipume.pdf
    • http://files.janiceandbud.com/uploads/1/3/1/4/131407299/696127.pdf
    • http://nefit.keenecinemas6.com/uploads/1/3/1/4/131407089/segolozogozipuxuji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/9832/4638/files/34377855393.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/perfect_world_international_classes.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4749/files/never_be_alone_shawn_mendes_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0428/2748/1255/files/49554525972.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/85201674198.pdf
    • https://cdn.shopify.com/s/files/1/0435/5493/0839/files/rosifedaluda.pdf
    • https://cdn.shopify.com/s/files/1/0431/8052/3678/files/50426346830.pdf
    • https://cdn.shopify.com/s/files/1/0435/3998/8648/files/baixar_leitor_para_android.pdf
    • https://cdn.shopify.com/s/files/1/0428/3426/4231/files/27362195755.pdf
    • https://cdn.shopify.com/s/files/1/0431/5830/6965/files/5972812434.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_off00005ec7.bin
c33033f93074bd82848da550e3d2af979d82a5f0f1ef40f1fb0524453cf0a2cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC7 5104 bytes
font_01_sfnt_off00006ff6.bin
b9356941713156a03810f0f2c4385404371bdcb2cc008cf9f675310015bfecfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF6 10276 bytes
font_02_sfnt_off0000933f.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x933F 4324 bytes

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