Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea55f8d96aea6d2d…

MALICIOUS

PDF

41.5 KB Created: 2020-08-20 08:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04fdc4135a4196219f054506dcb07ab4 SHA-1: 743cad9034a40494fe7e875fcfb710439da1648f SHA-256: ea55f8d96aea6d2d34360f7dc08db074b8e9d2ab192d069e322a536d427badee
128 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.ru/pify?keyword=aicp+certification+exam+study+guide, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the study guide and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of a link farm and a malicious redirector indicates a phishing or credential harvesting attempt.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=aicp+certification+exam+study+guide
    • http://files.roysdrivingschool.co.uk/uploads/1/3/0/9/130969322/6283250.pdf
    • http://doniwati.itsnotaboutthesexmyass.com/uploads/1/3/1/3/131383657/tojenuxok.pdf
    • http://files.cantstopforeveryimpala.com/uploads/1/3/0/9/130969054/9040689.pdf
    • https://cdn.shopify.com/s/files/1/0435/6089/4627/files/12035215518.pdf
    • https://cdn.shopify.com/s/files/1/0454/6166/7992/files/video_bobodoran_sunda_nguseup.pdf
    • https://cdn.shopify.com/s/files/1/0435/4539/5359/files/jiwaves.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8672/files/mawawevizulolukuvixidepa.pdf
    • https://cdn.shopify.com/s/files/1/0431/7482/2044/files/rumapotiwesi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7625/5897/files/mopozagudiwoni.pdf
    • https://cdn.shopify.com/s/files/1/0435/4539/5368/files/36911943979.pdf
    • https://cdn.shopify.com/s/files/1/0433/8660/1639/files/ap_budget_2020_20_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/3690/8439/files/95195493195.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/tecnologia_con_enfasis_en_informatica.pdf
    • https://cdn.shopify.com/s/files/1/0433/6546/6270/files/kaplan_nursing_school_entrance_exam.pdf
    • https://cdn.shopify.com/s/files/1/0433/8866/6017/files/catholic_devotional_prayer_book.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_off00006133.bin
fc1b4f648af0075ddd9c4f54d56a08e86dcabbc8d4165998a0744e8846034fae
pdf-font-stream PDF embedded font (sfnt) at offset 0x6133 5600 bytes
font_01_sfnt_off0000742c.bin
c636e52b3453945d4eb44c732817bac4a00d9930eefeed034315cb280a1d0de1
pdf-font-stream PDF embedded font (sfnt) at offset 0x742C 10796 bytes