Malicious PDF — malware analysis report

Static analysis result for SHA-256 c481f2876eb020fc…

MALICIOUS

PDF

43.2 KB Created: 2020-07-25 12:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebed9d64a2cec21799210259565bb8c0 SHA-1: a19fb6c9e0b54f9022733f614241d9e4f2e323b1 SHA-256: c481f2876eb020fcc0c08fe4a0c118a3ea5e175c36caab039497e555bd2c46ee
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a malicious redirector. The document body, though heavily obfuscated, appears to be related to educational content, suggesting a lure. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or exploits.

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=surface+area+prisms+and+cylinders+mathworksheets4kids
    • http://files.mrptristan.com/uploads/1/3/2/6/132682813/zotobatuna.pdf
    • http://files.learning4development.org/uploads/1/3/0/8/130815381/saselidujixe.pdf
    • http://files.nicktillia.com/uploads/1/3/0/7/130776204/4318768.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0300/files/98595796276.pdf
    • https://cdn.shopify.com/s/files/1/0430/9814/4932/files/80221351132.pdf
    • https://cdn.shopify.com/s/files/1/0433/5638/9528/files/35219906160.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4969/files/78322813900.pdf
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/99654261926.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38140624907.pdf
    • https://cdn.shopify.com/s/files/1/0432/1958/3138/files/23175453121.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97253363073.pdf
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/nadepolo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2240/9125/files/jinevuramobiwanamad.pdf
    • https://cdn.shopify.com/s/files/1/0428/2171/4079/files/78675606328.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/foliti.pdf
    • https://cdn.shopify.com/s/files/1/0433/0278/1083/files/radoneru.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/
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006aaa.bin
41db0e1ac5b5dd5d5d571ca60349b392ef67621525f2f7804b535ff29409aa8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AAA 5724 bytes
font_01_sfnt_off00007e0d.bin
3cc327bef89ff4b95167d89c1144c00b87313b674159bc8c9bf4e6d8434c3095
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E0D 9724 bytes