Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ce705847f30939…

MALICIOUS

PDF

51.5 KB Created: 2020-07-20 12:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfa2da820ebb35e4b8eb4b5e41af1906 SHA-1: 6b776104fa84ee794926f20cb8c7059830b0a90b SHA-256: c4ce705847f30939133a2b2e4b2620c931af3bb9478997d49d26308262ddb919
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to ttraff.ru, which is associated with SEO poisoning. Additionally, it features a PDF link farm with numerous links, many hosted on cdn.shopify.com, likely to manipulate search engine results. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact lure.

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=sharper%20image%20streaming%20edition%20video%20streaming%20drone%20manual
    • http://files.savannahsprinklerandirrigation.com/uploads/1/3/1/3/131383860/984c6b809ca20.pdf
    • http://files.rossdillon.com/uploads/1/3/1/8/131856232/zadetidemej_furokasulitul.pdf
    • http://files.airshowspresent.com/uploads/1/3/1/3/131398573/biwegiwiziwodur.pdf
    • http://files.conciearth.com/uploads/1/3/2/6/132682822/4857549.pdf
    • http://files.mepilan.co/uploads/1/3/1/4/131453989/kimex-mejaguwiloreva.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12909571685.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21533622499.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8374/files/61741181463.pdf
    • https://cdn.shopify.com/s/files/1/0434/0098/6787/files/mugixurobojaporevego.pdf
    • https://cdn.shopify.com/s/files/1/0429/2830/8387/files/92928035910.pdf
    • https://kisefavel526658237.files.wordpress.com/2020/06/lezovunivitejununaneb.pdf
    • https://juzakiwari.files.wordpress.com/2020/06/fusezijegijexuded.pdf
    • https://wowewuso.files.wordpress.com/2020/06/judiwukozisizusop.pdf
    • https://xazadin.files.wordpress.com/2020/07/riropogumu.pdf
    • https://fatevib.files.wordpress.com/2020/06/34809403615.pdf
    • https://cdn.shopify.com/s/files/1/0433/9345/0134/files/piluzofamisinozanatumixat.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jenodilibaxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3117/5063/files/gedaboxanipetalulurakalof.pdf
    • https://cdn.shopify.com/s/files/1/0430/4768/2201/files/batexiboruvid.pdf
    • https://cdn.shopify.com/s/files/1/0430/3867/1010/files/bamisemisuja.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vidabuvuwegorowomilamum.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62654677968.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_off00008983.bin
92b2c43b8b43c12d2c751ad2f814cd80c8fd5c0bdea6e6b00b0c1cb44c0681a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8983 5416 bytes
font_01_sfnt_off00009bcc.bin
0e85a083493362534075e0c90744419efa7efc191f4fcf3671e3dacb5414ecea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BCC 10472 bytes

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