Malicious PDF — malware analysis report

Static analysis result for SHA-256 35dfc58e41871b91…

MALICIOUS

PDF

42.2 KB Created: 2020-07-31 12:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d4a87accdfb08e4c28bdcf97615a907 SHA-1: ea12689efd301ad0b283aa72300ba755ee4d6141 SHA-256: 35dfc58e41871b91378d54f1517adbc07dc6f0f6bc593c0463d15e5be3f24b46
120 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that leads to a URL with a keyword suggesting a textbook download. This is further supported by heuristics indicating a link farm and embedded URLs. The primary attack pattern involves social engineering users into clicking the malicious link, likely to download further malware or lead them to a phishing page.

Heuristics 3

  • 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.
  • 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.cc/pify?keyword=holt+mcdougal+algebra+1+textbook+pdf
    • http://files.kireilifetherapy.com/uploads/1/3/0/7/130775652/7120309.pdf
    • http://files.techsun-breakrooms.com/uploads/1/3/0/8/130813988/jawakidiz.pdf
    • http://files.myveganmorocco.com/uploads/1/3/1/3/131380299/5380274.pdf
    • http://files.paisleyskinandlash.com/uploads/1/3/1/4/131436981/zikawisawomewel_wifosugo_vipuluvol_wedefe.pdf
    • http://files.paisleyskinandlash.com/uploads/1/3/1/4/131436981/zikawisaw
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24501063531.pdf
    • https://cdn.shopify.com/s/files/1/0432/4674/7803/files/61027197520.pdf
    • https://cdn.shopify.com/s/files/1/0434/2336/7335/files/toxeteposovu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0775/3888/files/kizorasovuwamanonepe.pdf
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/bomas.pdf
    • https://cdn.shopify.com/s/files/1/0436/5778/9605/files/witira.pdf
    • https://cdn.shopify.com/s/files/1/0433/1326/6846/files/nigejoseginalodebolozu.pdf
    • https://cdn.shopify.com/s/files/1/0440/5297/1685/files/50542991274.pdf
    • https://cdn.shopify.com/s/files/1/0433/4718/1718/files/35018896864.pdf
    • https://cdn.shopify.com/s/files/1/0438/5266/0901/files/fubapubugupuvuvebep.pdf
    • https://cdn.shopify.com/s/files/1/0427/3651/7286/files/24690147962.pdf
    • https://cdn.shopify.com/s/files/1/0438/2828/1506/files/50301508457.pdf
    • https://cdn.shopify.com/s/files/1/0432/5516/9186/files/34838589114.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_off00006573.bin
3e5f8c51dae23edee3aae5145f2ab485f3762ab8064e0eb19157e1f601c2aff2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6573 5312 bytes
font_01_sfnt_off0000778f.bin
a41c82f6b8fb6f25d33052aff6c90934e39adbb4cfa86a84e2ae84a63d5e9e3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x778F 10096 bytes

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