Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae0552ef681309e…

MALICIOUS

PDF

40.7 KB Created: 2020-08-23 04:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8200cded5256b7ef3dbdf6bc38993c4 SHA-1: 527fc9d536fc01a84e4ed108e33a91c850245482 SHA-256: aae0552ef681309ed7b22816f9a8291234dd62a511538a318e994bce67a61215
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of embedded links, indicating a link farm. The primary malicious URL identified is ttraff.ru, which is used in conjunction with a keyword that suggests a lure for users searching for specific content. The document body contains garbled text but also includes the malicious URL and several benign-looking Shopify URLs, suggesting an attempt to disguise the malicious intent. The ML classifier also strongly indicated maliciousness.

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=breath+of+the+wild+shader+cache
    • http://files.friendsofcherryorchardpark.org/uploads/1/3/2/3/132303219/6006201.pdf
    • http://files.emilyfuchs.ca/uploads/1/3/1/4/131483275/rusutuwut_gumudedikofege_lodewekur.pdf
    • http://falenaliw.sparklyshop.co.uk/uploads/1/3/0/7/130776262/tiguwebuweta.pdf
    • http://guvew.butterflycat.org/uploads/1/3/1/3/131398140/2785683.pdf
    • https://cdn.shopify.com/s/files/1/0430/7012/8277/files/97149937166.pdf
    • https://cdn.shopify.com/s/files/1/0436/4884/3929/files/54683168098.pdf
    • https://cdn.shopify.com/s/files/1/0434/9765/2376/files/navodaya_admission_form_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/5443/0368/files/zerodha_varsity_module_1.pdf
    • https://cdn.shopify.com/s/files/1/0433/8502/8758/files/guluzem.pdf
    • https://cdn.shopify.com/s/files/1/0437/7824/4765/files/alimentos_con_zinc.pdf
    • https://cdn.shopify.com/s/files/1/0437/6009/1287/files/43616539034.pdf
    • https://cdn.shopify.com/s/files/1/0428/6231/3631/files/rosojudi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7234/6526/files/81066856792.pdf
    • https://cdn.shopify.com/s/files/1/0427/8131/1132/files/89912281236.pdf
    • https://cdn.shopify.com/s/files/1/0429/6884/2393/files/19310214786.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053f9.bin
34260bb5fb07e734e81e292c7151a1614e3598cc7a501b72e6473f6a38102f81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53F9 4932 bytes
font_01_sfnt_off000064e6.bin
a15c5ad204243aa5b141039fbdf2b3dfa8110de20791e0082ee99028b1e0b2e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E6 10244 bytes
font_02_sfnt_off000087ea.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87EA 4324 bytes

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