Malicious PDF — malware analysis report

Static analysis result for SHA-256 388e5f5f146b8aee…

MALICIOUS

PDF

52.7 KB Created: 2020-08-07 14:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0bee36a669d1334bb63254dd930a13a SHA-1: a7231a9ae644ff235ca7e3eabbb2a7abec2fbcbc SHA-256: 388e5f5f146b8aee483ef0845cf08245d543c4f52866ece32b891de68ae58e71
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to Shopify-hosted PDFs. One URL, https://ttraff.cc/pify?keyword=accidente+cerebrovascular+cerebeloso+pdf, is identified as a malicious redirector. The ML classifier strongly supports the malicious verdict. The document body contains garbled text and references to 'wkhtmltopdf', suggesting it may be auto-generated content designed to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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.cc/pify?keyword=accidente+cerebrovascular+cerebeloso+pdf
    • http://files.artscienceexhibits.com/uploads/1/3/1/3/131384414/c0fd30eb0.pdf
    • http://files.whatcomexcavator.org/uploads/1/3/2/6/132682892/guxabotasefex_saradore.pdf
    • http://files.misobuildingptyltd.com/uploads/1/3/2/6/132695399/283c6529e301d.pdf
    • http://files.hccollab.com/uploads/1/3/0/7/130775922/7ff46a42f.pdf
    • http://files.asiacontentmarketing.net/uploads/1/3/1/8/131871433/luvisudawemoxe.pdf
    • https://cdn.shopify.com/s/files/1/0435/4700/0983/files/vumudizarudobuwup.pdf
    • https://cdn.shopify.com/s/files/1/0433/8555/3061/files/fuziwexisuwefukedejaro.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pitoparejiki.pdf
    • https://cdn.shopify.com/s/files/1/0430/5797/1362/files/usb_xtaf_xplore.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bipifapokuwegi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8488/2844/files/27615318268.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/blockchain_technology_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0433/0412/4580/files/jafarofiwul.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0827/files/90486767530.pdf
    • https://cdn.shopify.com/s/files/1/0430/4653/5322/files/difference_between_aliphatic_and_aromatic.pdf
    • https://cdn.shopify.com/s/files/1/0429/2401/5783/files/vuwufobisibenozimibo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1954/2434/files/56106123875.pdf
    • https://cdn.shopify.com/s/files/1/0431/5506/2948/files/lenipikegakugutupusofise.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ccc.bin
84fffd61a5c04e162c99a03d2e8de1afdc97dce14fe928de8873c8802750d1e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CCC 5220 bytes
font_01_sfnt_off00008e8a.bin
355de89340f71dd83dd641614ef254335141abeded6b9306d4acc5f23f85ade6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E8A 12788 bytes
font_02_sfnt_off0000b78b.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB78B 4324 bytes

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