Malicious PDF — malware analysis report

Static analysis result for SHA-256 61899eb7764c41fb…

MALICIOUS

PDF

41.1 KB Created: 2020-08-11 01:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a361700ad39926ec1163f8623570169b SHA-1: b1414d897a11ecfb0e37bdeb65a5ca533a80a402 SHA-256: 61899eb7764c41fb27e5560be9f8ad34956629584b7ee717c73c41df9745a324
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely intended to lure the user into clicking it. The document body also contains a large number of links to various PDF files hosted on Shopify, suggesting a link farm or SEO poisoning attempt to improve the ranking of the malicious redirector. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=medio+ambiente+definicion+pdf
    • http://files.mayacamasfinefoods.com/uploads/1/3/1/0/131070366/8aeebf4b67.pdf
    • http://files.grimballcotterill.com/uploads/1/3/1/6/131606121/9424990.pdf
    • http://files.wooddragonadvising.org/uploads/1/3/2/8/132816091/lefekejuna.pdf
    • http://files.premierweb.org/uploads/1/3/2/6/132681658/9718309.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/5271/8494/files/autumn_leaves_jazz_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0440/7679/4021/files/76208603667.pdf
    • https://cdn.shopify.com/s/files/1/0437/8486/3893/files/american_government_clep_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0430/5387/5357/files/gomidezofuzuvenexix.pdf
    • https://cdn.shopify.com/s/files/1/0435/9946/2558/files/bridge_rectifier_calculations.pdf
    • https://cdn.shopify.com/s/files/1/0444/7456/4775/files/toastmasters_advanced_manuals_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/7974/5192/files/66915678761.pdf
    • https://cdn.shopify.com/s/files/1/0440/7423/8102/files/47558939967.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/economistas_liberales.pdf
    • https://cdn.shopify.com/s/files/1/0436/0595/0626/files/8792387439.pdf
    • https://cdn.shopify.com/s/files/1/0435/1731/3176/files/tefobizasogupazijinil.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000627d.bin
0ee045c874c461334625712b030f15bd7a3e1392549713c02a809fbfaca47bce
pdf-font-stream PDF embedded font (sfnt) at offset 0x627D 5140 bytes
font_01_sfnt_off000073ee.bin
ac509c8a3877e5455e4b16fe47cdfe24c8191133f4f5857eeb14d356e49620e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x73EE 10516 bytes