Malicious PDF — malware analysis report

Static analysis result for SHA-256 0836c79d8b07bb44…

MALICIOUS

PDF

46.8 KB Created: 2020-08-30 08:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 594be6c60d10792c9a9c42b9b453208e SHA-1: 4b341e14999f78a7350f0e43941bd238fae86cb4 SHA-256: 0836c79d8b07bb44170d7648d795e226115b4f688ab86f646cb39db749eb0b65
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious due to its inclusion of a link to known malicious redirector infrastructure. It also contains a large number of external links, suggesting a link farm. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to a phishing site or malware download.

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/wix?keyword=solving+simple+algebraic+equations+w
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/0fdb6d_9c4fb7d5ed8f4c72acf0466e30788281.pdf
    • https://static.usrfiles.com/ugd/b8c837_7ec8654f047b474196717cf639bc79e3.pdf
    • https://static.usrfiles.com/ugd/b8c837_60662604c94b423e92e0442c2ad2d8d0.pdf
    • https://static.usrfiles.com/ugd/0e2875_83feeb4db1ea4631a519411a512e887c.pdf
    • https://static.usrfiles.com/ugd/0779a3_166a25421a714c789644836cb568ded4.pdf
    • https://static.usrfiles.com/ugd/b8c837_6938b56e0ada4c10b1e4f861b6c83288.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1909/files/animals_without_backbones_buchsbaum.pdf
    • https://cdn.shopify.com/s/files/1/0431/6394/3067/files/28679195223.pdf
    • https://cdn.shopify.com/s/files/1/0431/8950/2110/files/dharma_chakkaram_tamil_movie_hd.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3584/files/borderlands_2_thresher_bait.pdf
    • https://cdn.shopify.com/s/files/1/0438/6075/4582/files/41301033385.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006938.bin
0c5a82a653b4d9aaeced9e59b98d473dd58ee7aad957cd7dad012a687a146264
pdf-font-stream PDF embedded font (sfnt) at offset 0x6938 5656 bytes
font_01_sfnt_off00007c70.bin
067009ebf65d908ea5386016b201d51b89c799bd36d4d0012664512ab4291b27
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C70 10620 bytes
font_02_sfnt_off0000a030.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xA030 4324 bytes