Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ec7706e852866f…

MALICIOUS

PDF

47.6 KB Created: 2020-07-31 09:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d8d8d84517a090786bc4e49caa17ef1 SHA-1: 38dbbd560066ee27def8cc115c5a4ecc5e889e01 SHA-256: 56ec7706e852866f0b437097a5350c69bf77c61b1a834d265d66f2cf32774720
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The ML classifier strongly indicates maliciousness. The document appears to be a lure, using the text 'Cuentas del balance general pdf' to entice clicks on the embedded malicious URL. The presence of numerous other Shopify links suggests a link farm or SEO manipulation tactic.

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=cuentas+del+balance+general+pdf
    • http://files.edistoislandyouthrec.org/uploads/1/3/1/3/131380467/manikoropomume.pdf
    • http://files.brothersinthewild.com/uploads/1/3/0/7/130739802/lokewavudukodig.pdf
    • http://files.sweetpsalm.com/uploads/1/3/0/8/130874115/84d336fbc2bd3.pdf
    • http://files.lightningkali.com/uploads/1/3/0/8/130873851/suniviwutajisa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9753/9231/files/236817867.pdf
    • https://cdn.shopify.com/s/files/1/0431/7193/8453/files/38760081658.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/63047692882.pdf
    • https://cdn.shopify.com/s/files/1/0435/2396/5079/files/69561591069.pdf
    • https://cdn.shopify.com/s/files/1/0431/6394/3074/files/dozozotipukutad.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/69166134162.pdf
    • https://cdn.shopify.com/s/files/1/0429/5114/7676/files/45931161842.pdf
    • https://cdn.shopify.com/s/files/1/0430/7451/9194/files/2776589471.pdf
    • https://cdn.shopify.com/s/files/1/0432/0424/7715/files/depoberaximurabajawitu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0830/files/53764730929.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/23128739895.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_off00007de7.bin
6a687e251ecd4efbf7c09d952af2c8b29f4af99de2808c32c99249d2242b11eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE7 5208 bytes
font_01_sfnt_off00008fa2.bin
b3c2b788e831512773f1adfadee41b3f6e892119a97fc1cad0684d3195060dc5
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA2 9900 bytes