Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b00efa59d8c15c5…

MALICIOUS

PDF

44.2 KB Created: 2020-08-07 21:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1ccff7d9e166c3db4e0064ea1040830 SHA-1: 1db263fdb5e2a4410f40ff78e28da1178d343cc4 SHA-256: 1b00efa59d8c15c53ce51556924100bf33c0ab323443ccf9ece30f2220e77e2a
152 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external PDF files, with one primary URL identified as a malicious redirector. The document body, though heavily obfuscated, contains the same lure text and URLs, indicating an attempt to trick users into clicking malicious links. The ML classifier strongly supports the malicious nature of this PDF.

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.com/wb?keyword=list%20of%20workers%20compensation%20insurance%20companies%20in%20usa%20pdf
    • http://files.sixwhitehorses.info/uploads/1/3/0/7/130775918/5948674.pdf
    • http://files.qualisdecoratinggroup.com/uploads/1/3/0/7/130776485/vibevuzovepovenomiga.pdf
    • http://files.lacuralifestyle.com/uploads/1/3/1/3/131383661/e16bf5065cf.pdf
    • http://files.thrivedirecthealthcare.com/uploads/1/3/1/6/131606874/8433228.pdf
    • https://cdn.shopify.com/s/files/1/0430/7451/9194/files/ielts_writing_task_1_general.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0945/files/bolemurif.pdf
    • https://cdn.shopify.com/s/files/1/0450/8942/3525/files/weight_lifting_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0428/3593/5388/files/bubble_sorting_c.pdf
    • https://cdn.shopify.com/s/files/1/0429/0704/1958/files/6589923803.pdf
    • https://cdn.shopify.com/s/files/1/0429/2182/0313/files/korolubopexetiviregifalax.pdf
    • https://cdn.shopify.com/s/files/1/0428/5195/8947/files/selection_sort_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0430/7025/9357/files/japasimojulabukajaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/0809/0535/files/20385358797.pdf
    • https://cdn.shopify.com/s/files/1/0430/8054/8503/files/52068822847.pdf
    • https://cdn.shopify.com/s/files/1/0435/9503/8877/files/sword_fighting_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3640/files/zozamosalut.pdf
    • https://cdn.shopify.com/s/files/1/0430/4053/8773/files/vugejidevipemewimet.pdf
    • https://cdn.shopify.com/s/files/1/0432/8282/5371/files/understanding_business_12th_edition_amazon.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_off00006e75.bin
d5176cac1e971c0ca7a8fd0eecf56eb971a50e71aa428ffc60fb5466eba26da3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E75 5368 bytes
font_01_sfnt_off000080be.bin
46dcc0cb83fca288d734a642be1d11a01a67dd0e3e9098b24a416b9bc86716f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80BE 10060 bytes

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