Malicious PDF — malware analysis report

Static analysis result for SHA-256 990cd9b77e7ef96d…

MALICIOUS

PDF

41.8 KB Created: 2020-08-22 00:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31a0a23ad26ed003168f88f86f631f10 SHA-1: c31342dee4120831807884911e5c04b1f10f49b6 SHA-256: 990cd9b77e7ef96d7103f0150d425721bfb42cabd06bfe623c378bfba767b397
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to a link farm hosted on cdn.shopify.com. One prominent link, https://ttraff.cc/pify?keyword=speaky+apk+for+pc, is identified as a malicious redirector. This suggests the document's primary purpose is to lure users into clicking malicious links, likely for phishing or malware distribution.

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=speaky+apk+for+pc
    • http://files.homcov.com/uploads/1/3/0/8/130813357/tubenevoxotal_keduviromar.pdf
    • https://cdn.shopify.com/s/files/1/0429/9731/7783/files/destiny_2_exotic_catalyst_spreadsheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/3574/4673/files/korean_anime_boy.pdf
    • https://cdn.shopify.com/s/files/1/0433/9413/8277/files/sounder_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/4642/0136/files/22039470071.pdf
    • https://cdn.shopify.com/s/files/1/0435/9438/3522/files/cbse_class_12_biology_syllabus_2020_20.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nebisineseboji.pdf
    • https://cdn.shopify.com/s/files/1/0432/4209/4755/files/dg_a_b_c_d_check.pdf
    • https://cdn.shopify.com/s/files/1/0461/9780/1111/files/pre_listing_presentation_template.pdf
    • https://cdn.shopify.com/s/files/1/0439/2806/0059/files/gaxebi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1924/files/ferujufolazotisup.pdf
    • https://cdn.shopify.com/s/files/1/0432/3059/3186/files/85314495249.pdf
    • https://cdn.shopify.com/s/files/1/0433/5009/8085/files/ambient_air_pollution.pdf
    • https://cdn.shopify.com/s/files/1/0434/7537/0136/files/757407565.pdf
    • https://cdn.shopify.com/s/files/1/0436/1850/0765/files/36969700557.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006532.bin
54caf0c4cdbfbc27bc7d2e8381d03fce739c1f0f99e3c921b265754945fbf823
pdf-font-stream PDF embedded font (sfnt) at offset 0x6532 5068 bytes
font_01_sfnt_off0000768a.bin
139365961fbba14e95e76069e38a75f622136554adfeb8d2f6928deb571803f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x768A 10420 bytes