Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc16ac8360d515a3…

MALICIOUS

PDF

90.6 KB Created: 2020-08-07 19:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd162cdce660ffc5463afc0489e34958 SHA-1: c0835582e9c2614a6dc87eb1bf872c45ee92630c SHA-256: cc16ac8360d515a379264eb205394c3af3bb83ce4622d9e87178d2e2ae91fca3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=caida+libre+pdf+ejercicios+resueltos'. Additionally, it features a PDF link farm heuristic, indicating a large number of external links, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirect URL, reinforcing the malicious intent. The primary attack pattern involves luring users to a malicious site via a deceptive link.

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=caida+libre+pdf+ejercicios+resueltos
    • http://files.oldwisdomnewmoon.com/uploads/1/3/0/9/130969498/4025225.pdf
    • http://files.weekendarting.com/uploads/1/3/1/4/131438563/bccf09a1.pdf
    • http://files.graciebarrabath.com/uploads/1/3/1/6/131636807/mojinikoxajupugiguz.pdf
    • http://metureb.fairwindsvilla.com/uploads/1/3/1/1/131163599/8983e.pdf
    • https://cdn.shopify.com/s/files/1/0428/0716/5095/files/kibuketukidozisubifibese.pdf
    • https://cdn.shopify.com/s/files/1/0429/9236/9823/files/925687171.pdf
    • https://cdn.shopify.com/s/files/1/0438/4056/9494/files/91516213166.pdf
    • https://cdn.shopify.com/s/files/1/0434/1540/4702/files/53556183129.pdf
    • https://cdn.shopify.com/s/files/1/0435/8501/1873/files/67273001092.pdf
    • https://cdn.shopify.com/s/files/1/0434/0183/8744/files/balanis_antenna_theory.pdf
    • https://cdn.shopify.com/s/files/1/0427/7560/9510/files/26485195894.pdf
    • https://cdn.shopify.com/s/files/1/0432/6352/5026/files/sewefofabopujetarejomujap.pdf
    • https://cdn.shopify.com/s/files/1/0431/8239/1451/files/puluxunakorigesu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5240/0789/files/kojagiredilababe.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1549/files/75127830985.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_off000115c1.bin
a10c6c6a470ce30a1ef121574f520e4da517db1dbca011e16a1012a59aa170e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115C1 5164 bytes
font_01_sfnt_off00012760.bin
a46dd97760d9e6b405865849f85394e528a1afdb23eb7cd412067a345966c5d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12760 11684 bytes
font_02_sfnt_off00014d79.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D79 4324 bytes

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