Malicious PDF — malware analysis report

Static analysis result for SHA-256 6900143d9e3ff05b…

MALICIOUS

PDF

49.0 KB Created: 2020-08-04 16:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba5c86562fc21fcc9acf1b6f3a5f4af7 SHA-1: 3827c2b606bda61ce0963357166b44888948c1bf SHA-256: 6900143d9e3ff05bb71468042f301cc3dd2a9574a9139bb2caef26ab602597ef
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, identified as a link farm, with one prominent URL leading to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to 'Original cinderella story pdf'. The ML classifier strongly indicates maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful content.

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=original+cinderella+story+pdf
    • http://files.yourhomeshows.com/uploads/1/3/1/3/131398583/9656367.pdf
    • http://files.oceanviewlotuvita.com/uploads/1/3/0/8/130873798/takirare.pdf
    • http://files.pheasantruncavaliers.com/uploads/1/3/0/7/130775432/rematonanabifoxi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/metikamixalogub.pdf
    • https://cdn.shopify.com/s/files/1/0428/2590/8383/files/sotaxawopuxela.pdf
    • https://cdn.shopify.com/s/files/1/0436/0781/8398/files/91451130740.pdf
    • https://cdn.shopify.com/s/files/1/0430/6416/4506/files/rolizalufezuxilarapi.pdf
    • https://cdn.shopify.com/s/files/1/0429/0173/3542/files/17645817996.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/ibm_lotus_viewer.pdf
    • https://cdn.shopify.com/s/files/1/0433/7798/3653/files/9367394967.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6241/files/99873705644.pdf
    • https://cdn.shopify.com/s/files/1/0430/8143/3242/files/52888587756.pdf
    • https://cdn.shopify.com/s/files/1/0431/5466/9729/files/96416932376.pdf
    • https://cdn.shopify.com/s/files/1/0429/0838/5439/files/pubiwuwebuwajewuwe.pdf
    • https://cdn.shopify.com/s/files/1/0431/9015/7473/files/63443596164.pdf
    • https://cdn.shopify.com/s/files/1/0428/7086/6087/files/40259296582.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007fdb.bin
2e156de2544ae7a1e531a109a960f6eb56e15594341ff6353ac99565e76f48e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FDB 5452 bytes
font_01_sfnt_off0000927a.bin
d07f86f7323fd8d3bb6e90f27fb337b4bb6f5a3e9c97077012ef7ba0f220e09f
pdf-font-stream PDF embedded font (sfnt) at offset 0x927A 10240 bytes