Malicious PDF — malware analysis report

Static analysis result for SHA-256 12390a8f970c682b…

MALICIOUS

PDF

42.3 KB Created: 2020-09-01 17:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78cdde60698d7f56743aed1b798029e3 SHA-1: 3dd9a08b549b3f2bf87448024a63dbd0a26bf148 SHA-256: 12390a8f970c682b7f0cbbf14a1c50759454811f4f5071a8a8048c95ae6ee629
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with at least one identified as a malicious redirector. The document body itself is heavily obfuscated and contains both a malicious URL and numerous benign-looking URLs, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely related to phishing or malware distribution.

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.ru/wix?keyword=m%25E1%25BB%2599t+s%25E1%25BB%2591+template+powerpoint+%25C4%2591%25E1%25BA%25B9p
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5229/3541/files/anushka_shetty_movie_songs.pdf
    • https://cdn.shopify.com/s/files/1/0432/4684/6119/files/fuxatigojizogajofob.pdf
    • https://cdn.shopify.com/s/files/1/0427/8213/0332/files/63782253318.pdf
    • https://cdn.shopify.com/s/files/1/0436/2692/2146/files/srikakulam_burrakatha_naa_songs.pdf
    • https://static.usrfiles.com/ugd/405339_0f112d7e709d4cd8b5399b26c50d2558.pdf
    • https://static.usrfiles.com/ugd/9e53d4_39231d37eb1e4107acc6d71cc7cff5a1.pdf
    • https://static.usrfiles.com/ugd/253000_f67640204c354bed83b58a653731784d.pdf
    • https://cdn.shopify.com/s/files/1/0437/4121/6917/files/r4_card_for_ds.pdf
    • https://cdn.shopify.com/s/files/1/0427/6381/3020/files/kewelomuperisofaveboga.pdf
    • https://cdn.shopify.com/s/files/1/0433/6081/3208/files/fusopajivekanerubasove.pdf
    • https://cdn.shopify.com/s/files/1/0428/7735/4143/files/lirufitu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2784/0675/files/brothers_in_arms_apk_and_obb.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8577/files/zabonepisebunuxabuxat.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_off00006323.bin
dbc698ae4127bfe4f74de2d1727c7f7d978d415d3e8accd395db53f03ff99f47
pdf-font-stream PDF embedded font (sfnt) at offset 0x6323 5676 bytes
font_01_sfnt_off000075a0.bin
8c6bd6053eba08cccc2ff2569ee69630512b9c0e753714c89b0b51e9e88ed262
pdf-font-stream PDF embedded font (sfnt) at offset 0x75A0 10896 bytes