Malicious PDF — malware analysis report

Static analysis result for SHA-256 19481c62f7597c4a…

MALICIOUS

PDF

39.2 KB Created: 2020-08-24 09:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c88d9d8de38afc8d57084e7a62bb77f SHA-1: 878c95642a92ee2659faf68338a9d83541295b19 SHA-256: 19481c62f7597c4a882118b46d874e8e5962e2d8de177d7aa7e246abf1cf4ef9
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 that is known to host malicious content. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further malicious sites or downloads.

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=championship+manager+2010+psp
    • http://padurotut.incubator143.org/uploads/1/3/1/3/131379394/4068087.pdf
    • http://files.naturesblissjamaica.com/uploads/1/3/1/6/131637150/d93828baf670.pdf
    • http://files.webbcityfarmersmarket.com/uploads/1/3/0/7/130738720/f88f82778d6f1.pdf
    • http://fejisovu.bellaragazza.net/uploads/1/3/1/3/131383483/1721196.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1320/9246/files/29862790929.pdf
    • https://cdn.shopify.com/s/files/1/0438/2290/7554/files/vujir.pdf
    • https://cdn.shopify.com/s/files/1/0435/5050/7163/files/anhelos_del_corazon_libro.pdf
    • https://cdn.shopify.com/s/files/1/0429/0176/6310/files/4348914318.pdf
    • https://cdn.shopify.com/s/files/1/0435/3690/8439/files/51088875766.pdf
    • https://cdn.shopify.com/s/files/1/0459/7710/8647/files/pdf_to_word_program_best.pdf
    • https://cdn.shopify.com/s/files/1/0434/8215/3112/files/zolupiriwoxovibotuke.pdf
    • https://cdn.shopify.com/s/files/1/0448/4136/9761/files/22475417358.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1557/files/sogepoduzevonotevizel.pdf
    • https://cdn.shopify.com/s/files/1/0436/9121/2950/files/zujuful.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3464/files/wokez.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_off00005b90.bin
0f7ba408330824a0fb6c4d7af63c9bb4a1c1076310099c63867bdb05831f2a2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B90 5432 bytes
font_01_sfnt_off00006dea.bin
0df99c3ec12b510485aac8edd6c4bc4e50a6742c044cf4afadad2bdf34e52a4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DEA 9952 bytes