Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d4ed734521c6b1…

MALICIOUS

PDF

40.4 KB Created: 2020-08-13 23:38:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8527e4bcd5b477bee9d57aaf24336ead SHA-1: 06cffb0206092b55e141903b982de4c0128257b9 SHA-256: 81d4ed734521c6b117daca9cf3cd4545f121370de7c5eec2acd092201a2508f4
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources, indicating a link farm. One critical heuristic identified a PDF link to a known malicious redirector, ttraff.cc, which is used to obscure the final destination. The document body, though partially corrupted, contains text suggesting a lure related to "pre algebra with pizzazz answers page 190", likely intended to trick users into clicking the malicious link. No scripts were extracted from this sample.

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=pre+algebra+with+pizzazz+answers+page+190
    • http://files.leannastibbonmakeup.co.uk/uploads/1/3/0/9/130969710/e1b024.pdf
    • http://files.professorfinance.com/uploads/1/3/0/7/130775245/894232aabcd4f.pdf
    • http://files.thenutritionhutt.club/uploads/1/3/2/6/132681690/rodebobafinim-guputo-xugede.pdf
    • http://files.augustinoloprinzi.com/uploads/1/3/0/7/130776791/bidekapimup-xanibalijora-fedonevagugep.pdf
    • https://cdn.shopify.com/s/files/1/0436/0703/1966/files/xadejaxepotobawule.pdf
    • https://cdn.shopify.com/s/files/1/0427/5961/8716/files/juwemebozomizudiduba.pdf
    • https://cdn.shopify.com/s/files/1/0434/0717/9941/files/90947501740.pdf
    • https://cdn.shopify.com/s/files/1/0431/6938/2557/files/keronevodumetojovakal.pdf
    • https://cdn.shopify.com/s/files/1/0434/1992/6679/files/a_dozen_a_day_book_3_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38608120386.pdf
    • https://cdn.shopify.com/s/files/1/0433/0255/1716/files/zegapipamu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1817/4120/files/anlagenbuchhaltung_mit_sap.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/46970193860.pdf
    • https://cdn.shopify.com/s/files/1/0433/0304/3230/files/36143391082.pdf
    • https://cdn.shopify.com/s/files/1/0428/9639/2348/files/13521888126.pdf
    • https://cdn.shopify.com/s/files/1/0431/7760/7324/files/zexifoxow.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_off00005e5a.bin
3dbceaa74803be18a53205765b66740f214a33c688de9fd70d6283724bf68bf6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E5A 5712 bytes
font_01_sfnt_off000071e1.bin
7a534d2a5d1373b73f9f1af88af97349002b2c8a32e86a4b6f95e7407d63d1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x71E1 10288 bytes