Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f338ca1533800ca…

MALICIOUS

PDF

63.7 KB Created: 2020-08-10 17:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d014314eb400beeafb6570ff380258be SHA-1: 57d7f7002506476e930cee6d134d92c2dd0bf5f7 SHA-256: 3f338ca1533800caef60cb815f0fb1f3b1947b430edf4480fc804a6b1d0dbb24
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://ttraff.ru/pify?keyword=breakthrough+book+pdf', is flagged as a malicious redirector, indicating an attempt to direct users to harmful content. 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=breakthrough+book+pdf
    • http://misab.boardroomdevelopment.com/uploads/1/3/2/7/132712207/ridukep_febufabot_mafem.pdf
    • http://dugejej.emporiumofcanton.com/uploads/1/3/0/7/130776791/buziri.pdf
    • http://files.thegoldenstateacademyschoolofspeechanddebate.com/uploads/1/3/2/7/132740362/8998923.pdf
    • http://files.dawnrushmd.com/uploads/1/3/1/0/131069899/5223611.pdf
    • https://cdn.shopify.com/s/files/1/0432/1699/4466/files/21890791879.pdf
    • https://cdn.shopify.com/s/files/1/0432/1850/1799/files/the_ghost_inside_my_child.pdf
    • https://cdn.shopify.com/s/files/1/0434/9237/6741/files/cognition_and_learning.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/laxigitifudavizemitipa.pdf
    • https://cdn.shopify.com/s/files/1/0435/1895/1576/files/bexigutola.pdf
    • https://cdn.shopify.com/s/files/1/0437/8689/5512/files/ancyl_membership_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/4583/8232/files/6312826370.pdf
    • https://cdn.shopify.com/s/files/1/0432/1479/9012/files/41174984302.pdf
    • https://cdn.shopify.com/s/files/1/0433/0592/6809/files/71218361463.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5221/files/wivena.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000c555.bin
02eb96ff1307bdb36842fd616f7abc87c7077ef12e47384adf408d181243ab7f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC555 18512 bytes
font_00_sfnt_off00008f63.bin
68d099bf1039615ef9d4a6f4927501f402562e6cd7e6319b9e3b5dee1851f866		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F63 5076 bytes
font_01_sfnt_off0000a0ba.bin
cccc224df5ab04b09f0add37146cdc0109ff7223a1419cf76a662c197bfb3328		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0BA 10732 bytes
font_03_sfnt_off0000e305.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE305 4324 bytes

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