Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd05bb15d47a0b8…

MALICIOUS

PDF

54.6 KB Created: 2020-08-15 07:39:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e37defd9162d65e845d8f0c943e4739 SHA-1: 76bcaa217dd434954c6acc2288bf846c8a67c771 SHA-256: 6cd05bb15d47a0b84daa2a2ddd1352a0cd2e46ea5f849c0ce6dcc6e4bd15a585
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning attempt. One prominent URL, 'https://ttraff.cc/pify?keyword=w%25C3%25B6rterbuch+deutsch+arabisch+kostenlos++pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily garbled, contains the same redirector URL and other PDF links, reinforcing the lure.

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=w%25C3%25B6rterbuch+deutsch+arabisch+kostenlos++pdf
    • http://files.surprisescorpionsaz.com/uploads/1/3/2/7/132740930/466699.pdf
    • http://files.dspespta.com/uploads/1/3/0/8/130874115/jururer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/6974/4028/files/69762455362.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/2581582401.pdf
    • https://cdn.shopify.com/s/files/1/0432/0513/2445/files/sesalaxegobufupasuxipuzi.pdf
    • https://cdn.shopify.com/s/files/1/0440/8187/3048/files/american_english_file_starter_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/3274/7927/files/kufowiga.pdf
    • https://cdn.shopify.com/s/files/1/0431/4116/9303/files/60237362953.pdf
    • https://cdn.shopify.com/s/files/1/0428/2790/7239/files/53195704617.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0497/files/bread_bakery_business_plan.pdf
    • https://cdn.shopify.com/s/files/1/0432/1076/8546/files/turezadejezerabit.pdf
    • https://cdn.shopify.com/s/files/1/0428/0667/3575/files/ghersi_cemento_armato_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rokagarunawawutasa.pdf
    • https://cdn.shopify.com/s/files/1/0436/9979/8166/files/amplitud_de_movimiento_articular.pdf
    • https://cdn.shopify.com/s/files/1/0429/9885/7891/files/honda_gcv160_spark_plug.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006421.bin
80f55d39da0dd56295a155b5f21d871dbbac85f3a4f1f78f8c451d1c93a80c37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6421 6320 bytes
font_01_sfnt_off000079e2.bin
acd7332feb2c9f827bfecdbe4cce973c3e71828357348794e7e6fe94bdf02ecc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79E2 5600 bytes
font_02_sfnt_off00008cb6.bin
cb4cd1a28de054b7cdb195072ba14dd86626d61c2bd36bf63ee3502294c711eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CB6 11504 bytes
font_03_sfnt_off0000b26a.bin
584b304305be6dd33cf5ff756bb9bb923dca467a12e1162c4c4015662de3a9c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB26A 16760 bytes

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