Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e9a43951bc5a527…

MALICIOUS

PDF

59.6 KB Created: 2020-08-15 06:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 306b9f83bd0689ea330e71520e13b84d SHA-1: 138dd18ec4e2594311b35e044b3574e710178138 SHA-256: 5e9a43951bc5a527ba350dbfa0b1125a55c34ffe894de38b0d9d25b08c407e38
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, which is flagged as malicious. The document body also contains the same URL, suggesting a lure to download free software. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.com/pify?keyword=free++apache+openoffice+for+android
    • http://files.annepauley.com/uploads/1/3/1/4/131453536/34cdfebc96970.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://www.opentle.org
    • https://cdn.shopify.com/s/files/1/0431/0115/9585/files/xabosikatijiwige.pdf
    • https://cdn.shopify.com/s/files/1/0432/1820/6888/files/zajapaveba.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8357/files/90193330033.pdf
    • https://cdn.shopify.com/s/files/1/0433/1444/6489/files/antigone_jean_anouilh_francais.pdf
    • https://cdn.shopify.com/s/files/1/0432/8924/7894/files/64008929894.pdf
    • https://cdn.shopify.com/s/files/1/0437/1965/5579/files/jeruxatibukimubijodef.pdf
    • https://cdn.shopify.com/s/files/1/0430/3876/9303/files/ohh_kill_em_download.pdf
    • https://cdn.shopify.com/s/files/1/0447/3529/9738/files/temuzi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5469/3537/files/bio_energy_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0434/1697/7559/files/building_construction_book_sushil_kumar.pdf
    • https://cdn.shopify.com/s/files/1/0440/0496/6565/files/vabijinexa.pdf
    • https://cdn.shopify.com/s/files/1/0437/5497/9477/files/72594649361.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://www.gnu.org/licenses/lgpl.htmlRegularDanhHong
    • http://www.geocities.com/dnhhng
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ea6.bin
12b611b0b4f58368cde3337404c9ad2f2e42aa57c45e3b0c76aa36b1a3759ffe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA6 5004 bytes
font_01_sfnt_off0000704a.bin
18986791eb3ae7208de73530aa8ce60dfae8e86e23deb30705c58ae6c7e4a257		 pdf-font-stream PDF embedded font (sfnt) at offset 0x704A 4988 bytes
font_02_sfnt_off00008132.bin
dbaab8dcf32bfe64cb008f34eb54f5316f62236e8dffe3de49b44225404383a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8132 2656 bytes
font_03_sfnt_off00008c30.bin
a47959a8a0c44ddf6b8e998b6dd727bd4d99d6980137c168d359ab97f64ba13a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C30 5032 bytes
font_04_sfnt_off00009b98.bin
2da83060ad210a9a1743b04a22b2cc5ebb14ba7af64fbaa5f25da2d26a1b3d84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B98 6640 bytes
font_05_sfnt_off0000ad36.bin
0e9ebf2328f07ed2415b1420aad25cdb49259f5d7ed637f6b9305b8952328f47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD36 11460 bytes
font_06_sfnt_off0000d3fb.bin
9a3e7af0855b0971ed4e960d1afbabbea6ba84bf45843a09ca44cec8f7261173		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FB 2832 bytes

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