Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d73a0b0b71ffad…

MALICIOUS

PDF

39.8 KB Created: 2020-08-19 03:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e09e15bdb2a3a0ae9969851892bf1d16 SHA-1: f33994aa72d127e5355c97b436b7fac105588c46 SHA-256: 71d73a0b0b71ffad47ab85588a0021c68b21545f222044eb5903ffbd895a91d8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary links directs to a known malicious redirector, indicating a malicious intent to lead the user to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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=calidad+de+vida+ambiental+pdf
    • http://files.b-khairbooks.com/uploads/1/3/1/0/131069978/tanuzoroken-vezesajosevup-pabelep-wotumo.pdf
    • http://files.vbtherapist.com/uploads/1/3/1/0/131070469/razekuva.pdf
    • http://vebisabal.playmake-believe.com/uploads/1/3/1/4/131406749/jekulukaropativ.pdf
    • http://files.bendigochinesemedicine.com/uploads/1/3/1/6/131606343/gepejuwarime.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/3652/2149/files/surerajifurosevo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7063/6710/files/bijevufur.pdf
    • https://cdn.shopify.com/s/files/1/0430/6495/0946/files/37961566779.pdf
    • https://cdn.shopify.com/s/files/1/0431/6934/9794/files/jotenepijogula.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/muledodabuvubezonisoxa.pdf
    • https://cdn.shopify.com/s/files/1/0435/3320/5655/files/zapatofosupi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/cambridge_key_english_test_extra.pdf
    • https://cdn.shopify.com/s/files/1/0428/6060/9692/files/pusasedofepefonibotelu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7113/6154/files/wamapanukirinudip.pdf
    • https://cdn.shopify.com/s/files/1/0434/6963/5746/files/shifty_eyes_emoji.pdf
    • https://cdn.shopify.com/s/files/1/0427/4028/5607/files/xegimikaxubidulalot.pdf
    • https://cdn.shopify.com/s/files/1/0428/4363/5879/files/67429759230.pdf
    • https://cdn.shopify.com/s/files/1/0439/1626/3592/files/96037603119.pdf
    • https://cdn.shopify.com/s/files/1/0433/5311/2735/files/the_flash_barry_allen_comics.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_off00005f3c.bin
5be907899f88cae2427cf1d00e6773256ab065b16bbe9e546be60b57a7afed5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3C 5016 bytes
font_01_sfnt_off00007040.bin
a88841c65a53f8bba0150d868b11d6279aee98cead6c982f83b7bafba7f2ef0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7040 10452 bytes

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