Malicious PDF — malware analysis report

Static analysis result for SHA-256 78bb56b272c77153…

MALICIOUS

PDF

44.8 KB Created: 2020-08-25 16:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9d8ce780b2b9890d6f6b29289770ca0 SHA-1: fb37f972d952a213fc182ee0ad80a54d97210148 SHA-256: 78bb56b272c771537ec49cccaca0fccd6bac1e74f38befcca5f9032a14185b60
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to funnel victims to further malicious content. The document body, though heavily obfuscated, contains this URL and numerous other links to PDFs hosted on Shopify, suggesting a link farm or redirection strategy. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a malicious URL.

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=tamil+movies+2017++tamilrockers+hd
    • http://files.luftgear.com/uploads/1/3/0/7/130775917/boxupuzibij.pdf
    • http://bumibezo.nejcrwc.com/uploads/1/3/0/7/130739235/kamikifo.pdf
    • http://xoxowev.greenfamilydentistry.com/uploads/1/3/2/8/132814930/093901.pdf
    • http://files.gemmamcneill.co.uk/uploads/1/3/1/6/131636725/relenavurasivax.pdf
    • http://files.airacademywrestling.com/uploads/1/3/1/3/131380427/bce20.pdf
    • https://cdn.shopify.com/s/files/1/0437/3820/2273/files/59601307141.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6248/files/tizilijeg.pdf
    • https://cdn.shopify.com/s/files/1/0464/3291/1512/files/adaalat_episode_388.pdf
    • https://cdn.shopify.com/s/files/1/0431/0486/2374/files/75260197730.pdf
    • https://cdn.shopify.com/s/files/1/0431/2596/4957/files/rafiroroteviziv.pdf
    • https://cdn.shopify.com/s/files/1/0430/0124/9955/files/vigojimunubojavosamege.pdf
    • https://cdn.shopify.com/s/files/1/0435/5411/1656/files/zubijufozekew.pdf
    • https://cdn.shopify.com/s/files/1/0433/8561/8583/files/nuvarofefejowenapijod.pdf
    • https://cdn.shopify.com/s/files/1/0438/5246/4293/files/28215850201.pdf
    • https://cdn.shopify.com/s/files/1/0430/9526/1348/files/97577403241.pdf
    • https://cdn.shopify.com/s/files/1/0430/8634/8450/files/allegra_120_mg_bula.pdf
    • https://cdn.shopify.com/s/files/1/0431/1197/3026/files/53398987263.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/38760480538.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_off000050aa.bin
a7bc720ef21a4d2325d7177a61f624cb44fae297d4153d3e2d1dd6aa8f2e19e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50AA 5660 bytes
font_01_sfnt_off000063d6.bin
1bec1aa59ce8e73385d82b04ad9f04cff1e230f88228ae80d46084f844d5189b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63D6 13724 bytes
font_02_sfnt_off00008f61.bin
7348a63ea9206f1dd9d85ac5b8e77a4d6d13d552d707fc8209e912c0db264539		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F61 16076 bytes

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