Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18a2f24681ba6b0…

MALICIOUS

PDF

67.8 KB Created: 2020-08-12 06:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d29af7136c97699a81b26d3514bfd8d0 SHA-1: 76f0b34a073a74fcfa66fe3c85cf9970c9faad07 SHA-256: b18a2f24681ba6b0820d592076a6e65c5dacd651a78f72788c9ee0accb90dafc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to suspicious domains and are likely part of a link farm designed to manipulate search engine results. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure, directing users to a page related to 'census in research methodology pdf'. This suggests a social engineering tactic to trick users into clicking malicious links.

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=census+in+research+methodology+pdf
    • http://deras.stephanierachelschwartz.com/uploads/1/3/1/4/131438563/71ad28d21.pdf
    • http://nimar.martindamon.com/uploads/1/3/0/7/130776738/2892337.pdf
    • http://files.wesmillermusiclessons.com/uploads/1/3/1/3/131383424/lofogumuwuzomazi.pdf
    • http://xudaj.americanfamilyfeed.com/uploads/1/3/1/6/131606407/xusimoz-folewef-nerodokazurab-lefovuxabejo.pdf
    • http://files.friendsofgoodwinforest.org/uploads/1/3/0/8/130874652/dafuse.pdf
    • http://deras.stephanierachelschwartz.com/uploads/1/3/1/4/13143856
    • https://cdn.shopify.com/s/files/1/0431/6548/3168/files/guitar_chords_chart_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/3748/9309/files/difumozoxalijigiwuzoze.pdf
    • https://cdn.shopify.com/s/files/1/0434/8225/1421/files/rivexivofitotetobowumi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0124/0985/files/toruviveronimaloxike.pdf
    • https://cdn.shopify.com/s/files/1/0431/3032/3101/files/how_to_get_advantage_5e.pdf
    • https://cdn.shopify.com/s/files/1/0429/7729/6543/files/dawojuvejifalogemafe.pdf
    • https://cdn.shopify.com/s/files/1/0432/6490/1270/files/52411264602.pdf
    • https://cdn.shopify.com/s/files/1/0440/6326/0822/files/kurofufe.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/47658923595.pdf
    • https://cdn.shopify.com/s/files/1/0427/6230/5702/files/32886318086.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_off0000bd26.bin
e43ea014414707ed82e2ec2d7b7a97f9a5fd6dd8021291a218d8e06de1149f3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD26 5576 bytes
font_01_sfnt_off0000cff4.bin
5d12bef356bb2d15379b64ee9574b6575810e5c193953eca9bd1a23f752ed40f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF4 10540 bytes
font_02_sfnt_off0000f3b2.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B2 4324 bytes

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