Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4d16b43fab5bad…

MALICIOUS

PDF

45.2 KB Created: 2020-09-16 17:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebcc1828799bb046efc7e515aa1099dc SHA-1: 8e226f29e2a509d01b994564ca60db1b5de75140 SHA-256: 9a4d16b43fab5bad96c4bac8f9b6422c4a3da4d5a25cb2eca152aa90e4a6a1f6
154 Risk Score

Malware Insights

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

The PDF contains a prominent link that, when clicked, redirects to a malicious URL. The document body text and embedded URLs suggest a lure for downloading an APK, likely leading to malware. The ML classifier strongly indicates maliciousness, and the PDF structure itself contains a link farm, further supporting a malicious intent.

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.me/wix?keyword=movie+hd+apk+download+apkpure
    • http://muweza.accentrixsolutions.com/uploads/1/3/2/6/132695829/5664835.pdf
    • http://vijalefin.i-teach.info/uploads/1/3/1/1/131164246/pexafureka-xofewefo.pdf
    • http://files.softandsound.org/uploads/1/3/0/8/130873902/93623c0a3919.pdf
    • https://cdn.shopify.com/s/files/1/0459/8733/2253/files/piragemavozazunoxamab.pdf
    • https://cdn.shopify.com/s/files/1/0437/7880/1822/files/31138784120.pdf
    • https://cdn.shopify.com/s/files/1/0434/9231/1206/files/70000790374.pdf
    • https://cdn.shopify.com/s/files/1/0480/4860/3300/files/animal_cruelty_reporting_laws.pdf
    • https://cdn.shopify.com/s/files/1/0440/5651/0616/files/92875022581.pdf
    • https://cdn.shopify.com/s/files/1/0429/9302/5187/files/incorrect_spelling_of_name_on_credit_report.pdf
    • https://cdn.shopify.com/s/files/1/0434/0957/1989/files/building_community_capacity_for_tourism_development.pdf
    • https://cdn.shopify.com/s/files/1/0438/4250/2818/files/employment_certificate_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/9243/5359/files/zujowabu.pdf
    • https://20da6dde-9fc9-462e-bf1c-eab8cc656e9b.filesusr.com/ugd/565485_aa11df0124d344b19a0d206b7c47e4ae.pdf?index=true
    • https://b26c3f1d-ca88-4051-b31d-49187ee004ed.filesusr.com/ugd/03ae60_861f674057f744799427275aa471a5d8.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061bd.bin
b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
pdf-font-stream PDF embedded font (sfnt) at offset 0x61BD 6744 bytes
font_01_sfnt_off000072a2.bin
f26d711cf1d533bb4229fe061e029733d272ac1cd9a78c79e2955f8a1af6bee0
pdf-font-stream PDF embedded font (sfnt) at offset 0x72A2 5088 bytes
font_02_sfnt_off0000840a.bin
34dee73ce50d2cff8fe68c4462579be854db26180c50560983c7bacf23feff76
pdf-font-stream PDF embedded font (sfnt) at offset 0x840A 10436 bytes