Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f14453d9d8aa5b0…

MALICIOUS

PDF

46.5 KB Created: 2020-08-19 08:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76997325fb599cd545d8c89f72e95de0 SHA-1: f4c2da6e463680a684d6ba4778e2484639cc1c31 SHA-256: 7f14453d9d8aa5b078b12c5187f08de4414d032ac53a747ad965885c7df80645
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body, though obfuscated, contains a URL that leads to this malicious redirector, suggesting a phishing or scam attempt. 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.cc/pify?keyword=android+studio+project+files+missing
    • http://files.steveneillsgarage.com/uploads/1/3/1/4/131409127/xisubibuxubob.pdf
    • http://kujari.yofisc.org/uploads/1/3/2/6/132681670/vagemuzo.pdf
    • http://files.wmhomeschoolers.com/uploads/1/3/0/9/130970009/a749d02.pdf
    • http://files.olga-ta-va.com/uploads/1/3/0/9/130969580/59490.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/1409/2960/files/uninstall_office_365_mac.pdf
    • https://cdn.shopify.com/s/files/1/0430/4414/3253/files/acronis_true_image_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0435/1026/8064/files/45310140058.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/mezeb.pdf
    • https://cdn.shopify.com/s/files/1/0438/1304/4386/files/corona_effect.pdf
    • https://cdn.shopify.com/s/files/1/0435/0282/9734/files/how_to_pin_a_message_on_discord.pdf
    • https://cdn.shopify.com/s/files/1/0430/9676/8661/files/64963699839.pdf
    • https://cdn.shopify.com/s/files/1/0434/0400/1443/files/sagona.pdf
    • https://cdn.shopify.com/s/files/1/0438/3745/6534/files/91503884108.pdf
    • https://cdn.shopify.com/s/files/1/0429/6677/8009/files/68481643642.pdf
    • https://cdn.shopify.com/s/files/1/0430/6278/8245/files/22956356404.pdf
    • https://cdn.shopify.com/s/files/1/0435/3445/0840/files/python_csv_to_json.pdf
    • https://cdn.shopify.com/s/files/1/0462/7261/0464/files/22105703249.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_off000078fd.bin
d4c123c84736e962c29376c182a31500e392cfe0bc1b3fd1b8fea44d42261469
pdf-font-stream PDF embedded font (sfnt) at offset 0x78FD 5332 bytes
font_01_sfnt_off00008b11.bin
53b56e2b83acd8ae82b548861d6364997c94f32bb913bda98d7606ee6b3f1020
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B11 9920 bytes