Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f32fa5cd4c39555…

MALICIOUS

PDF

44.9 KB Created: 2020-08-26 02:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3352e08087acf54652a6c1e8636d6ec3 SHA-1: 7a6029d22c0afcfdf6de9e71d4cd5f3271f798fb SHA-256: 0f32fa5cd4c39555a1ef94c18f7353c119b61465c8944cff098d07eb8bc1470e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, forming a link farm, with one critical URL pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL and a benign-looking title, suggesting a lure to disguise the malicious intent. No scripts were extracted, but the primary attack vector appears to be directing users to malicious infrastructure.

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/pify?keyword=ek+tera+naam+hai+sacha+mp3+song+down
    • http://files.geras.sk/uploads/1/3/2/6/132680901/sipamiratifo_negebuse.pdf
    • http://tirikukig.coulterhouseapparel.com/uploads/1/3/1/4/131453109/bonap-jebuf-divowafowebit-minifijuxotalu.pdf
    • http://files.shainahardie.com/uploads/1/3/2/6/132680986/jivedamu_maxesat_tofanome.pdf
    • http://files.manisteecd2.org/uploads/1/3/1/6/131606546/wukonawopepevesise.pdf
    • http://files.northwoodsspecialties.com/uploads/1/3/0/7/130740072/2972f1cae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8914/0643/files/attribution_theory_in_social_psychology_kelley.pdf
    • https://cdn.shopify.com/s/files/1/0431/3235/4711/files/train_time_table_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0475/5096/files/bacaan_sholat_muhammadiyah.pdf
    • https://cdn.shopify.com/s/files/1/0429/2627/6775/files/fubituvewos.pdf
    • https://cdn.shopify.com/s/files/1/0436/1384/7710/files/misiwawuketefoga.pdf
    • https://cdn.shopify.com/s/files/1/0433/6871/0300/files/pogivagigogetixek.pdf
    • https://cdn.shopify.com/s/files/1/0431/7695/1965/files/channel_pear_roku.pdf
    • https://cdn.shopify.com/s/files/1/0434/2058/2050/files/tencent_buddy_emulator_english.pdf
    • https://cdn.shopify.com/s/files/1/0434/0904/7708/files/player_s_handbook_2_4e.pdf
    • https://cdn.shopify.com/s/files/1/0431/7960/6176/files/65904522579.pdf
    • https://cdn.shopify.com/s/files/1/0428/9314/8313/files/bandel_station_platform.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81159011373.pdf
    • https://cdn.shopify.com/s/files/1/0440/7800/6437/files/saliwozotozuziraloj.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000530f.bin
61471f34e0718036b81da194cc6b0bc9e3b76ab4a68199c10626009611443b22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x530F 5732 bytes
font_01_sfnt_off0000666c.bin
f84eca34327b5aa955e8c4d8630e4c3afe9d9b572de066b9ee03d9b37671316f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x666C 13632 bytes
font_02_sfnt_off00009198.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9198 16204 bytes

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