Malicious PDF — malware analysis report

Static analysis result for SHA-256 e74704a71e58406c…

MALICIOUS

PDF

44.6 KB Created: 2020-08-14 21:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19740828d45f860dfc193d853eb36459 SHA-1: 5bb259f94aa19a3c61943f046aba3af154d40144 SHA-256: e74704a71e58406c8f974b700ac8b9beefc19faa3fcdd6c0740a16c6a22ba267
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains URLs that are part of a link farm, with one pointing to a known malicious redirector. This suggests the document's primary purpose is to lure users to malicious infrastructure. No scripts were extracted from this sample.

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=seamless+pipe+sizes+in+mm+pdf
    • http://files.adamhamdy.net/uploads/1/3/0/8/130815026/e1816ffb.pdf
    • http://files.kidscareacademyfmcog.com/uploads/1/3/1/1/131164418/d28eba204.pdf
    • http://files.archi-technology.com/uploads/1/3/0/7/130739713/berasumodofab_xetilib_tusewuvajogubut_tunivaxapes.pdf
    • http://files.ymbagroup.com/uploads/1/3/1/6/131636806/mizumi_fenadibanere.pdf
    • https://cdn.shopify.com/s/files/1/0432/3033/1040/files/43346273678.pdf
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/17675337051.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0368/files/40000697029.pdf
    • https://cdn.shopify.com/s/files/1/0433/2063/9646/files/kgf_thrilling_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/jajiwitepupawun.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/2637901555.pdf
    • https://cdn.shopify.com/s/files/1/0430/1871/5289/files/rusutiganiwu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1558/files/deger.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/domojuvorebanawewobeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/1157/9809/files/gupimufogapaneturepe.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5600/files/convert_to_word_free_download_nitro.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/59284627763.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_off000063c6.bin
4592113ed2a1ae3ffaff4d9843d0b17aff74c10cdc87a8071caefad137535027
pdf-font-stream PDF embedded font (sfnt) at offset 0x63C6 5244 bytes
font_01_sfnt_off00007593.bin
9e9c517c6d6b891771a139a4d4e98b868eecc4045cd89f3026ce9e6868a1f3fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x7593 15196 bytes