Malicious PDF — malware analysis report

Static analysis result for SHA-256 8344f57020cf10f1…

MALICIOUS

PDF

42.8 KB Created: 2020-08-19 23:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5336caabd3756079224de4e0c191ed2b SHA-1: 502611ef822c0ea37092c247be2deab88c60d6c5 SHA-256: 8344f57020cf10f15a68d592b6aac077f4604c6fe155f7689354b7326857e066
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the document body, though heavily obfuscated, contains text related to the malicious URL. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content.

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=manual+coffee+grinder+near+me
    • http://files.cngwritersink.com/uploads/1/3/0/7/130776211/0d61b407d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5679/8613/files/ranger_boat_trailer_parts.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/45591331598.pdf
    • https://cdn.shopify.com/s/files/1/0431/2596/4949/files/film_american_pie_6_sub_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0428/1729/0406/files/91989561940.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/figarawevig.pdf
    • https://cdn.shopify.com/s/files/1/0432/3957/1616/files/48014006788.pdf
    • https://cdn.shopify.com/s/files/1/0437/9515/3058/files/low_back_exercise_aaos.pdf
    • https://cdn.shopify.com/s/files/1/0433/6553/1806/files/8988343991.pdf
    • https://cdn.shopify.com/s/files/1/0431/5522/6781/files/les_contes_interdits_blanche_neige.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8551/files/easy_snacks_recipes_in_tamil.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_off000069f8.bin
808bd257b723a5b79b77d3de5fa9aee988ead9e0c7cb9a20805764cb4d3e5b6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x69F8 5168 bytes
font_01_sfnt_off00007b75.bin
14a73ea977c5e52d05f003c410f7532453036fc9686e9928d2e6f5343fc45d55
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B75 10328 bytes