Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9edcfaccca2904…

MALICIOUS

PDF

39.4 KB Created: 2020-08-24 13:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5342541cd35398c35237fdbaac6c304 SHA-1: 3b38389a0de2f7080e49a0e1330b4a49a671fe21 SHA-256: 0f9edcfaccca2904c9967676eed031882efcaf44a1876f1481ce9189db064189
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, disguised as nutrition information. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests a link farm or SEO poisoning attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or redirection attack.

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.cc/pify?keyword=beefy+crunch+burrito+nutrition+information
    • http://files.blackdustsculptures.com/uploads/1/3/0/7/130739415/e6cdc66236b6be6.pdf
    • http://files.spanish-charts.com/uploads/1/3/1/3/131380107/18659.pdf
    • http://files.berglundvet.com/uploads/1/3/0/8/130874253/relesapituwuguw.pdf
    • http://files.jazzbluesanddiamonds.com/uploads/1/3/0/8/130814121/ledojod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/6343/3629/files/nakugifixufiwejukejujini.pdf
    • https://cdn.shopify.com/s/files/1/0428/6912/9372/files/89088092666.pdf
    • https://cdn.shopify.com/s/files/1/0428/8764/3302/files/bozufafasurezurafa.pdf
    • https://cdn.shopify.com/s/files/1/0436/4802/4741/files/numbers_in_german_language.pdf
    • https://cdn.shopify.com/s/files/1/0432/4429/0205/files/basha_tamil_movie_video_song.pdf
    • https://cdn.shopify.com/s/files/1/0435/9094/2888/files/53337926420.pdf
    • https://cdn.shopify.com/s/files/1/0446/1743/3251/files/khan_academy_mappers.pdf
    • https://cdn.shopify.com/s/files/1/0431/2779/9969/files/83809392000.pdf
    • https://cdn.shopify.com/s/files/1/0435/9149/9935/files/windows_10_education_iso.pdf
    • https://cdn.shopify.com/s/files/1/0432/1656/8487/files/ikov_corporeal_beast_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/7390/4545/files/folabozil.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6200/files/dikitizogogipefel.pdf
    • https://cdn.shopify.com/s/files/1/0429/8814/2743/files/jekobuwejotogimejaxe.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_off00004dce.bin
88ccf758e9b5589583012f0d1c34e59424966be7054d4fbdc4ab8dcf5878c6c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DCE 5084 bytes
font_01_sfnt_off00005ef1.bin
436311520d4323d94bcc4513d3bffcaff687717f2c7001967111822fa55ff1a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF1 10288 bytes
font_02_sfnt_off00008229.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8229 4324 bytes

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