Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dec05157a014a3d…

MALICIOUS

PDF

42.8 KB Created: 2020-08-25 15:39:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55f441eace2d3e1d816e2079cbe9fc71 SHA-1: d60d9242d760f70c866cd1b92c54d1f3ad86451d SHA-256: 5dec05157a014a3de0d6a8ccea82e906f15b9f987ebb9e38ac261d34ed4d342c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links and text that mimic a download for Spotify premium, but the primary link redirects to known malicious infrastructure. The document body, though heavily obfuscated, contains the malicious URL and references to 'Spotify premium free apk ios 2018', indicating a phishing or scam attempt. The presence of numerous external PDF links also suggests a link farm, a common tactic for SEO manipulation and traffic redirection.

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.ru/pify?keyword=spotify+premium+free+apk+ios+2018
    • http://files.writinglifebarbaraoneil.com/uploads/1/3/1/1/131164488/nenefubiwurabuwawo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8556/8925/files/argosy_property_annual_report_2017.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kuvesagapixunijibofalase.pdf
    • https://cdn.shopify.com/s/files/1/0428/7266/8319/files/advanced_maths_book_for_ssc_cgl.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51994241049.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6429/files/atrial_flutter_management.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/wijedofikagufawut.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13879903487.pdf
    • https://cdn.shopify.com/s/files/1/0433/3033/8966/files/nobewogevedonoxod.pdf
    • https://cdn.shopify.com/s/files/1/0431/9582/6336/files/designing_audio_power_amplifiers_bob_cordell.pdf
    • https://cdn.shopify.com/s/files/1/0438/1789/4050/files/46800839635.pdf
    • https://cdn.shopify.com/s/files/1/0437/8030/9141/files/basketball_score_sheet_excel_fiba.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_off000067be.bin
5e619069ce1d747fe2a3cb597292db0858ca8aa0df308e598379e9dd74ac3e1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x67BE 5804 bytes
font_01_sfnt_off00007b73.bin
6fe8dee66ecda27b67a6a6862d0f9540c37a8c1c00119dac67e28e3e4465702d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B73 10268 bytes