Malicious PDF — malware analysis report

Static analysis result for SHA-256 1357ce757544fffa…

MALICIOUS

PDF

43.8 KB Created: 2020-08-30 20:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a13bcc88fab6e7827b5f26d4aeeb9a0e SHA-1: d65572b739f32b30e65111f7de764190aea61538 SHA-256: 1357ce757544fffa23b8cc950f7131d3353b7b26c75d78c359c8dbe279a99840
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to a known malicious redirector, which is further supported by the ML classifier's high confidence score. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs suggest an attempt to redirect the user to malicious infrastructure, likely for further exploitation or phishing.

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.me/wix?keyword=download+mp3+song+coca+cola+tu
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6999/7217/files/nasawimukitifogi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/voriwatovetizejewadodo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7880/files/fesona.pdf
    • https://cdn.shopify.com/s/files/1/0438/3549/0466/files/biharwap_in_2017_video.pdf
    • https://cdn.shopify.com/s/files/1/0437/2217/8710/files/pozegaxilakibisera.pdf
    • https://cdn.shopify.com/s/files/1/0447/5830/2869/files/agriculture_biodynamique.pdf
    • https://cdn.shopify.com/s/files/1/0428/6464/0159/files/systematic_random_sampling_technique.pdf
    • https://cdn.shopify.com/s/files/1/0433/3908/8027/files/42758798344.pdf
    • https://static.usrfiles.com/ugd/097bd5_7f9cb0ac65094b1db7a4f636d4b1f5f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_0394808d7bf8439389b815fea504f58a.pdf
    • https://static.usrfiles.com/ugd/b8c837_3842ec0a0f7e494db8f98f513ddb4dfc.pdf
    • https://static.usrfiles.com/ugd/b8c837_03e71a6d8ab54cdc899373fa898d0b7f.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9812/files/50906337718.pdf
    • https://cdn.shopify.com/s/files/1/0438/5538/0630/files/black_desert_kunoichi_gear_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4549/files/27858220236.pdf
    • https://cdn.shopify.com/s/files/1/0466/2866/7557/files/centerville_city_schools_forms.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_off00006c38.bin
512428f583af190ebe3226bf21d97a3d0b2ecd0577f68c8c2b9d183e9b187fc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C38 5552 bytes
font_01_sfnt_off00007f1a.bin
2e006b44ebc187fc9945b01af00fbe031c1e9268fb90586261c22615289d5bff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F1A 10352 bytes

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