Malicious PDF — malware analysis report

Static analysis result for SHA-256 a670ad9c4b30c3ff…

MALICIOUS

PDF

42.2 KB Created: 2020-08-13 06:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bbdabe5c804d131a39bcbbdefa10a8d SHA-1: 6a252cc00b737a1747722ce38f7fad0eab9c3ed9 SHA-256: a670ad9c4b30c3ff458d6421bea40dec1de1cf2c046f188256d38c3b1c341a4d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass of external links, with the primary link pointing to a known malicious redirector at 'ttraff.ru'. This suggests the document is designed to lure users to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous SEO-like PDF links further supports a malicious intent, likely for phishing or malware delivery.

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/pify?keyword=civil+registration+system+pdf
    • http://povetu.mimiandhillshop.com/uploads/1/3/1/4/131437736/3027852.pdf
    • http://files.stealth-phones-guide.com/uploads/1/3/1/8/131871618/fitusa.pdf
    • http://files.morongovalley.org/uploads/1/3/0/7/130775174/e9beec8.pdf
    • https://cdn.shopify.com/s/files/1/0429/2971/7407/files/wudupuwobinenabafav.pdf
    • https://cdn.shopify.com/s/files/1/0434/1586/3447/files/arm_microcontroller_tutorial_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0431/0381/3781/files/lolejoxototidon.pdf
    • https://cdn.shopify.com/s/files/1/0430/6970/2306/files/mezetoxapotawu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6372/1637/files/17357726791.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/lagujefixikogilonijegoso.pdf
    • https://cdn.shopify.com/s/files/1/0434/9794/7300/files/rawifikemajuwez.pdf
    • https://cdn.shopify.com/s/files/1/0428/2476/1510/files/zekujutezisalunixefutu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0514/7298/files/trane_voyager_troubleshooting_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/5731/4977/files/14944466617.pdf
    • https://cdn.shopify.com/s/files/1/0431/6335/3244/files/descriptive_writing_rubric_middle_school.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000668d.bin
08d40e7cf0a327e88f48a007302d5555cc0744b7a3fdedb605a8f84f5b94cc09
pdf-font-stream PDF embedded font (sfnt) at offset 0x668D 5428 bytes
font_01_sfnt_off000078f8.bin
b4adc46fc0591cdca080eb55c181c6ce9e5cd1dacf49b396364795ae06ac2770
pdf-font-stream PDF embedded font (sfnt) at offset 0x78F8 10304 bytes