Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0fc723693931706…

MALICIOUS

PDF

44.1 KB Created: 2020-09-16 21:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e274f32fc23a6611b813c045752349e7 SHA-1: 029ac9fc1578b3e68da0a06c3ef7bb457fd232fa SHA-256: f0fc723693931706cb9935800b534ace9a660554ec4837bc63a007aa24f62090
154 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, specifically pointing to a URL related to downloading APKs. Additionally, it features a large number of external PDF links, many hosted on Shopify, suggesting a link farm designed to attract users searching for specific software. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to download potentially harmful applications via a deceptive link farm.

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.link/wix?keyword=bully+apk+download+aptoide
    • http://nosasu.pamelagossett.com/uploads/1/3/1/4/131406226/domun.pdf
    • http://gewelo.inward-bound.co.uk/uploads/1/3/0/8/130814416/ef8f041607.pdf
    • http://revar.waukeshacountyconservatory.com/uploads/1/3/0/8/130813694/5346410.pdf
    • http://turepobat.rlesmedia.com/uploads/1/3/1/0/131070581/6471185.pdf
    • http://fiwiker.maid4uae.com/uploads/1/3/1/3/131383761/2b6632626789f3.pdf
    • https://cdn.shopify.com/s/files/1/0429/1900/2268/files/install_pubg_apk_in_bluestacks.pdf
    • https://cdn.shopify.com/s/files/1/0438/3840/6806/files/ap_learners_module_grade_8.pdf
    • https://cdn.shopify.com/s/files/1/0438/1392/9122/files/arthur_c._clarke_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/8191/5802/files/windows_server_2016_iso.pdf
    • https://b10d9f71-635b-424d-95b6-a82c8fa03498.filesusr.com/ugd/529dbf_dca699f3c456400eb1ec04ce0d9a9eb6.pdf?index=true
    • https://e6c6b546-58b8-45bc-a672-539299aa6a0e.filesusr.com/ugd/eddc50_8d340c76dd6149398ceb12d0986510b9.pdf?index=true
    • https://5527f429-5b42-4ddf-88e6-ba62bb3e6b35.filesusr.com/ugd/33a2e4_b47eb86f8b214dc29637e9754ae7b18e.pdf?index=true
    • https://ca36e547-b6cf-481e-bbc3-35431c5b11c0.filesusr.com/ugd/510a18_d12c26bf463b4561aad73e382d277560.pdf?index=true
    • https://9efad565-59fc-4249-b289-bc0c6fee64e9.filesusr.com/ugd/544e7e_8e61811e46cc4cd7aa01ebc0ca27dcdb.pdf?index=true
    • https://6fe19302-ded3-4181-9d25-50260c4cbb76.filesusr.com/ugd/e49726_0536fa7644134b6094b99d3da23bfb49.pdf?index=true
    • https://597868f8-5cce-4092-b445-5b55016070bb.filesusr.com/ugd/a4d998_e849b88554704ba88d8da12d129d0827.pdf?index=true
    • 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_off00006f64.bin
740f956adf8306bfe8f661d16c300283d3f0e4525ca3fd3ad88c24007cdc2e8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F64 4984 bytes
font_01_sfnt_off0000808c.bin
3b20663a2ed0e5c93bc7897ca84fbb0ae216bda06af2149abe762090bf44558b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x808C 10412 bytes

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