Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4da2c00900179db…

MALICIOUS

PDF

41.9 KB Created: 2020-08-10 14:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78d1c93acdf57aea63e7cd2cc11428dd SHA-1: 87b03d5a17ed96c1b91b70b5771af486fec9a37f SHA-256: c4da2c00900179db3687ea967248fab7bd396d0cb8ac3c82e6ae37cd5d4dfbf1
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 a link farm hosted on Shopify. One of the primary links directs to a known malicious redirector. The document body, though heavily obfuscated, also contains the same malicious URL, suggesting an attempt to lure users to malicious websites under the guise of providing business proposal samples.

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.ru/pify?keyword=business+proposal+letter+samples+pdf
    • http://files.rmdobermans.ca/uploads/1/3/0/9/130969166/nalazu_nekavamusivowa_xitabosuvabesuz.pdf
    • http://files.greenlightinspection.com/uploads/1/3/0/8/130813428/dibisoke-janofupesaji-wegijagikit-vubiponiz.pdf
    • http://files.qwiksolar.com/uploads/1/3/2/7/132740498/wowevuti_gasilepasoki_zekekoninuk_ralis.pdf
    • http://jomafibu.madelinedonnerstag.com/uploads/1/3/0/8/130814124/84168353e3f07.pdf
    • https://cdn.shopify.com/s/files/1/0436/4494/4542/files/activity_based_costing_definition.pdf
    • https://cdn.shopify.com/s/files/1/0434/7668/0869/files/public_speaking_merit_badge_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4967/files/babosas.pdf
    • https://cdn.shopify.com/s/files/1/0430/9948/8423/files/bigapuzowuredu.pdf
    • https://cdn.shopify.com/s/files/1/0438/2497/1936/files/lomemigejuturufofoxemoza.pdf
    • https://cdn.shopify.com/s/files/1/0439/7580/3038/files/dijutudesaferadivapeven.pdf
    • https://cdn.shopify.com/s/files/1/0430/4997/5959/files/65331308385.pdf
    • https://cdn.shopify.com/s/files/1/0431/0302/7361/files/laporan_pendahuluan_bronchopneumonia_pada_anak.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0512/files/datefer.pdf
    • https://cdn.shopify.com/s/files/1/0432/3957/1616/files/bpsc_65_advertisement.pdf
    • https://cdn.shopify.com/s/files/1/0437/1031/6694/files/baumer_absolute_encoder.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zovoxumaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/2292/6492/files/berlin_u_bahn_map.pdf
    • https://cdn.shopify.com/s/files/1/0438/3932/4325/files/assam_newspaper.pdf
    • https://cdn.shopify.com/s/files/1/0432/5172/8546/files/xesubulebomi.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_off000066bf.bin
709afeb32ede18c7866653a11d3c53359c8392d42475c0094de7102ebff52ce3
pdf-font-stream PDF embedded font (sfnt) at offset 0x66BF 5236 bytes
font_01_sfnt_off0000786d.bin
c5461b0dd0faaa97044fed2612debebb4dccaf937785a9dac9663dccc0daae8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x786D 10004 bytes