Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67dfd85cf577a6c…

MALICIOUS

PDF

47.0 KB Created: 2020-08-11 13:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ff15d62ecc3c24b31cebea1bf55cea0 SHA-1: 67697f8a16c820ee1ddf49a5fd6d820c768a6667 SHA-256: b67dfd85cf577a6c0770413ce263a606678e7c63ef71843fb124a3a5b97a2cf6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, specifically 'https://ttraff.cc/pify?keyword=assam+cabinet+minister+list+2020+pdf'. This indicates the document is designed to lure users to a potentially harmful site. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external links, many hosted on Shopify, which is often used to disguise malicious content. No scripts were extracted, but the presence of the malicious redirector is sufficient evidence of malicious intent.

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=assam+cabinet+minister+list+2020+pdf
    • http://files.roberthinds.net/uploads/1/3/1/4/131483138/jidufus.pdf
    • http://files.pennohiovet.com/uploads/1/3/0/8/130813054/wasozutapibof.pdf
    • http://files.martienvanzuilen.com/uploads/1/3/0/8/130814680/9866589.pdf
    • https://cdn.shopify.com/s/files/1/0432/3164/1767/files/imagine_dragons_amsterdam_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0428/6038/0327/files/african_countries_and_their_colonial_masters.pdf
    • https://cdn.shopify.com/s/files/1/0435/4611/6248/files/dojajefizurexesipamenagix.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/moduzibupazokemekowi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7482/2044/files/kenmore_he2_dryer.pdf
    • https://cdn.shopify.com/s/files/1/0440/7253/4166/files/disney_descendants_2_script.pdf
    • https://cdn.shopify.com/s/files/1/0434/1356/9690/files/41658788382.pdf
    • https://cdn.shopify.com/s/files/1/0433/9915/1768/files/58110920092.pdf
    • https://cdn.shopify.com/s/files/1/0434/0452/5720/files/audi_q5_2013_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/4368/4503/files/26484215559.pdf
    • https://cdn.shopify.com/s/files/1/0435/1351/2100/files/expositor_s_bible_commentary.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d26.bin
9dd3e15a5f54ad7873fe5751b4a02d8822b8d5cc91ef27c1d0abb5e94d33a66b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D26 5380 bytes
font_01_sfnt_off00007f42.bin
45e5270fd7221b8085bee6c79445624129d40bb510979a2ea0f862a161f68195		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F42 9852 bytes
font_02_sfnt_off0000a100.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA100 4324 bytes

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