Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e12a674a4c3d196…

MALICIOUS

PDF

39.9 KB Created: 2020-09-05 21:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21b25f9f1ceade50fcfad44d510a3188 SHA-1: 70bf02123b34f2277274c0e6282e02464bb0bcb9 SHA-256: 8e12a674a4c3d196f2ee723fcbb667bebc325a7719ce608bab39f7b221cdd988
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a career aspirations sample answer, aiming to lure users to a malicious site. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL and references to other PDFs hosted on Shopify, likely part of a link farm designed to improve SEO for malicious content.

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.club/wix?keyword=career+aspirations+sample+answer
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/lezogejatubulifaxusoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/3797/4940/files/13260236171.pdf
    • https://cdn.shopify.com/s/files/1/0432/3514/7933/files/pegikofefojoramo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5172/8546/files/28466831543.pdf
    • https://cdn.shopify.com/s/files/1/0429/3980/9959/files/tekokiguxodoma.pdf
    • https://cdn.shopify.com/s/files/1/0434/8697/0018/files/15063238747.pdf
    • https://cdn.shopify.com/s/files/1/0440/0247/6190/files/dudeviderovi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/nepexasewuwubuwo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7663/2214/files/78120264845.pdf
    • https://cdn.shopify.com/s/files/1/0429/5488/3231/files/right_triangle_trigonometry_word_problems_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/4760/8730/files/31954952235.pdf
    • https://cdn.shopify.com/s/files/1/0430/3867/1010/files/54018683983.pdf
    • https://cdn.shopify.com/s/files/1/0431/0777/8717/files/allowable_stress_design.pdf
    • https://cdn.shopify.com/s/files/1/0459/8398/9922/files/free_bunco_score_sheets_fall.pdf
    • https://cdn.shopify.com/s/files/1/0438/4836/8288/files/sunixatajabod.pdf
    • https://cdn.shopify.com/s/files/1/0435/5801/1035/files/risc_in_computer_architecture.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_off00005ea2.bin
24a5453372bc76080e9d986a8de3cbb7be8b205c643057f78a93b41c86bf853d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA2 4964 bytes
font_01_sfnt_off00006f7b.bin
ed81ac0c98630138ca54f6cbae147144a82d80d9109db2a3ae32d4b927134fba
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F7B 10468 bytes