Malicious PDF — malware analysis report

Static analysis result for SHA-256 83bd17fcdfc1ec77…

MALICIOUS

PDF

36.1 KB Created: 2020-08-17 05:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5f76f5ec57fa97dc288fc26f33406f3 SHA-1: 5311970eecb5c20ca84ddf0fc5a04fdaa46a9c7c SHA-256: 83bd17fcdfc1ec77a081cfce80a570531dfd5a0ef84fa282b32bbf201b859a23
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure related to "Hiromi piano sheet music" and embeds a large number of external links, many of which point to Shopify domains hosting other PDFs. One of the initial links, https://ttraff.com/pify?keyword=hiromi+piano+sheet+music, is identified as a malicious redirector. The heuristic SE_PASSWORD_ARCHIVE_LURE suggests that this document may be part of a chain to deliver a password-protected archive, a common tactic to bypass security scanners.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.com/pify?keyword=hiromi+piano+sheet+music
    • http://files.artfine.com/uploads/1/3/1/1/131164130/tinoka.pdf
    • http://files.fastmolly.com/uploads/1/3/1/4/131453247/jufixovupo-panejaduzo.pdf
    • http://sidiravi.norawickman.com/uploads/1/3/1/4/131483281/5590750.pdf
    • http://files.buggybarnmuseum.com/uploads/1/3/0/7/130738939/1459293.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1008/8342/files/clicker_heroes_hacked_unlimited_gold.pdf
    • https://cdn.shopify.com/s/files/1/0435/3998/8648/files/74020781458.pdf
    • https://cdn.shopify.com/s/files/1/0439/2986/2312/files/17714153605.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4745/files/zovaju.pdf
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/rubozogezopifidivuloxowo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6567/9776/files/tanda_gejala_penyakit_jantung_koroner.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/lepilomaporudakapitalifex.pdf
    • https://cdn.shopify.com/s/files/1/0434/0852/3416/files/tafsir_al_quran_tematik.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3789128943.pdf
    • https://cdn.shopify.com/s/files/1/0436/5982/1209/files/lokage.pdf
    • https://cdn.shopify.com/s/files/1/0447/5263/4005/files/63969089391.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8714/files/zujixobodepaziwotonigure.pdf
    • https://cdn.shopify.com/s/files/1/0433/7781/9802/files/kuvup.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000438d.bin
1aa6e8da6217f4357e6cfa9a5d30a5c14a95a5d5b8df1d44f9eb13e4e0ff43d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x438D 3572 bytes
font_01_sfnt_off00005075.bin
db91576040b5d5570af3e959edead28f56c2632a30786fdbeae065108132ec28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5075 5100 bytes
font_02_sfnt_off00006190.bin
9800f0e6f9b0a32bbc1732f0c6e8c4d04fab2708618a215468660a9e89c6f394		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6190 9868 bytes

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