Malicious PDF — malware analysis report

Static analysis result for SHA-256 44cd676ba07ec3e5…

MALICIOUS

PDF

34.1 KB Created: 2020-08-10 16:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20cc656607b7e51df933b33ee7519f8c SHA-1: f818e18d499c923b3b7802d6776ec020782476bd SHA-256: 44cd676ba07ec3e578ef15f291120e49c51816915d689b6c1ebd14df56ffe217
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify-hosted PDFs, forming a link farm designed to improve search engine ranking. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is presented as a "Catia v5 exercise book pdf". This suggests the document's primary purpose is to trick users into clicking malicious links, likely leading to malware downloads or phishing pages. The ML classifier strongly supports the malicious nature of this PDF.

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=catia+v5+exercise+book+pdf
    • http://files.thegivingend.com/uploads/1/3/1/3/131379578/e1e7f9.pdf
    • http://files.michaelandreula.com/uploads/1/3/1/4/131406222/9753367.pdf
    • http://files.davidnakazono.com/uploads/1/3/2/6/132695629/0705c40a88471d.pdf
    • https://cdn.shopify.com/s/files/1/0428/9586/8057/files/femadolakonukigobide.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5816/files/49263446453.pdf
    • https://cdn.shopify.com/s/files/1/0433/9263/0940/files/todezuwifasepug.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nanejixiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/4194/7801/files/roxexumevenirob.pdf
    • https://cdn.shopify.com/s/files/1/0434/2457/9736/files/12373166242.pdf
    • https://cdn.shopify.com/s/files/1/0441/4016/7320/files/66829014002.pdf
    • https://cdn.shopify.com/s/files/1/0446/5931/0745/files/banking_chronicle_magazine_november_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/9318/1087/files/british_english_grammar_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bapumonotirugapagemuzigin.pdf
    • https://cdn.shopify.com/s/files/1/0431/4500/3169/files/un_cedaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/1485/6610/files/puruzisibegezamiwubod.pdf
    • https://cdn.shopify.com/s/files/1/0433/6323/8056/files/jofajamapajalotamo.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_off000046c9.bin
fc9d7fc64ef30e4bf3cc8703a68b2ce268395959c01aa0741866be16863ab216		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46C9 5476 bytes
font_01_sfnt_off00005980.bin
de39be6dc4ea6898643bd5d5299a657c5a675ffae00026401ade216944b1c0eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5980 9992 bytes

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