Malicious PDF — malware analysis report

Static analysis result for SHA-256 36bb1c16530fa9f9…

MALICIOUS

PDF

55.0 KB Created: 2020-08-23 22:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d37ac6ee0e5d2b8aa4068a84e47554d SHA-1: ecbcf744117f4405acf7ef877f53c58e07956296 SHA-256: 36bb1c16530fa9f9d37a38b90dcdc95a4e1cc06d4f335e5f31111909ae0836f4
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL designed to look like a 'Capsim guide pdf'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, and the ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the target URL, suggesting a phishing or scam attempt.

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=capsim+guide+pdf
    • http://kilivuku.canalmusicfest.com/uploads/1/3/0/7/130738792/5272471.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bodadajigewodozisidezufe.pdf
    • https://cdn.shopify.com/s/files/1/0433/6304/1430/files/motakiboz.pdf
    • https://cdn.shopify.com/s/files/1/0434/8782/1984/files/sevilla_isaac_albeniz_guitar.pdf
    • https://cdn.shopify.com/s/files/1/0433/5314/5495/files/3876340631.pdf
    • https://cdn.shopify.com/s/files/1/0435/2484/9815/files/blender_2._79_shortcut_keys.pdf
    • https://cdn.shopify.com/s/files/1/0434/5623/3638/files/appositive_phrase_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0435/6902/1091/files/rozita.pdf
    • https://cdn.shopify.com/s/files/1/0430/9506/4733/files/jufejimoketexovubeg.pdf
    • https://cdn.shopify.com/s/files/1/0429/2768/5788/files/90042303389.pdf
    • https://cdn.shopify.com/s/files/1/0429/3125/7510/files/fafoguwapudodaguroduwafik.pdf
    • https://cdn.shopify.com/s/files/1/0437/4197/0583/files/peloton_app_android_tv.pdf
    • https://cdn.shopify.com/s/files/1/0434/0377/2056/files/71538152559.pdf
    • https://cdn.shopify.com/s/files/1/0434/1687/9271/files/gregor_the_overlander_book_6.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_off0000983a.bin
796d7669b3edad6b3888c65dfeb29ca375b48fc80368e839ba5b260c9681a95b
pdf-font-stream PDF embedded font (sfnt) at offset 0x983A 5140 bytes
font_01_sfnt_off0000a9a4.bin
8fb93198ae254e337f4ba99cbb35d897183edf1c0b5709e712b0a24213124ed8
pdf-font-stream PDF embedded font (sfnt) at offset 0xA9A4 11080 bytes