Malicious PDF — malware analysis report

Static analysis result for SHA-256 28745fd2f390fe65…

MALICIOUS

PDF

32.1 KB Created: 2020-08-10 12:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3696cd1a7099719d86c6e97a95b156e0 SHA-1: a9be185e3fc36f2fdc9a9ae71825c8e9eba8fa90 SHA-256: 28745fd2f390fe655347b43715c4c62ac085d1b10b64c2ee5f8a688349598655
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. The primary redirector URL, https://ttraff.ru/pify?keyword=burrell+and+morgan+1979+book+pdf, is flagged as malicious. The ML classifier also strongly indicated maliciousness. The document's content appears to be obfuscated or corrupted, but the presence of a malicious redirector and a large number of links suggests a phishing or malware distribution attempt.

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=burrell+and+morgan+1979+book+pdf
    • http://files.escondidofoundationarch.org/uploads/1/3/2/6/132695200/mirop_videmifajizema_welamegade.pdf
    • http://gokova.13rays.org/uploads/1/3/1/4/131407315/6fb19.pdf
    • http://files.jsmountainpondfarm.com/uploads/1/3/1/4/131438823/1908314.pdf
    • https://cdn.shopify.com/s/files/1/0432/8967/3883/files/gubujinototikavebewume.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1120/files/kiresepegawavajaniviwifu.pdf
    • https://cdn.shopify.com/s/files/1/0440/0440/9494/files/25640917825.pdf
    • https://cdn.shopify.com/s/files/1/0435/4395/3567/files/minirudijitesurakovobo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9469/5324/files/kanokilupunodo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/ripidigiwiposag.pdf
    • https://cdn.shopify.com/s/files/1/0429/5802/8959/files/4118379005.pdf
    • https://cdn.shopify.com/s/files/1/0430/4565/0586/files/41646156084.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9345/files/43243810160.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6654/files/mijisuxogilebo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5453/0709/files/30337545252.pdf
    • https://cdn.shopify.com/s/files/1/0431/4356/1384/files/popoxilunojazavibasaxu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2333/4567/files/84058453949.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_off000043cf.bin
0c325938c02a5365e2d70c83b0e3b63791a9d8eb56faa2d0a0f2c48852fdbcfa
pdf-font-stream PDF embedded font (sfnt) at offset 0x43CF 5724 bytes
font_01_sfnt_off00005742.bin
37d702087a1ee0a9100d04489b037f0f33d5e5c0db6ac02bb3ed781190249adc
pdf-font-stream PDF embedded font (sfnt) at offset 0x5742 8404 bytes