Malicious PDF — malware analysis report

Static analysis result for SHA-256 907c7f5d5acc307a…

MALICIOUS

PDF

36.5 KB Created: 2020-09-18 18:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23702c5fdb7cb5b19daa54358b03f404 SHA-1: 2d640b15b004194b7566b2d3ee51fc7d041944ce SHA-256: 907c7f5d5acc307af8e2ae13cbea3297cb97891642f7cf31bcc9b47209466525
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, characteristic of a link farm. One of these links, 'https://ttraff.me/wix?keyword=abbey+road+apartments+decatur+ga', points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Abbey road apartments decatur ga' and references to wkhtmltopdf, suggesting a lure document. The presence of a large number of external PDF links, many hosted on Shopify, indicates an attempt to manipulate search engine results or distribute content through a seemingly benign platform, with at least one link leading to malicious activity.

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.me/wix?keyword=abbey+road+apartments+decatur+ga
    • https://cdn.shopify.com/s/files/1/0429/6713/8470/files/arabidopsis_thaliana_model_organism.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78682713185.pdf
    • https://cdn.shopify.com/s/files/1/0433/7949/0968/files/bewimarusategetu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5345/6289/files/assistant_executive_engineer_short_form.pdf
    • https://cdn.shopify.com/s/files/1/0462/7480/5922/files/98857252280.pdf
    • https://1ca62dd0-5f46-450b-b856-8323fd7787de.filesusr.com/ugd/38062a_18d40d815b7c4d238cbf3c6bbf85ad0b.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0439/0001/0664/files/ashes_cricket_2013_pc_iso.pdf
    • https://cdn.shopify.com/s/files/1/0450/3538/9086/files/building_self_confidence_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0432/0280/5921/files/danirusapidogilegiforono.pdf
    • https://cdn.shopify.com/s/files/1/0463/0570/6146/files/19876939269.pdf
    • https://cdn.shopify.com/s/files/1/0429/7333/1609/files/81935822831.pdf
    • https://cdn.shopify.com/s/files/1/0434/7602/5497/files/67912051881.pdf
    • https://cdn.shopify.com/s/files/1/0448/0555/4337/files/58038300630.pdf
    • https://cdn.shopify.com/s/files/1/0434/9244/2264/files/68303650957.pdf
    • https://cdn.shopify.com/s/files/1/0429/7300/3939/files/2296973521.pdf
    • https://cdn.shopify.com/s/files/1/0433/1044/8798/files/52748893193.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_off00004b03.bin
09a1e786211bf97ffe45dddeab939f0e73248d00beafbd761f0129f508c933b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B03 5592 bytes
font_01_sfnt_off00005dfc.bin
9ca61735b051bd53e062f95db7f4f45ca46a58908e1583e5a716b9b85cc38cce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DFC 12124 bytes

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