Malicious PDF — malware analysis report

Static analysis result for SHA-256 53363210abd02292…

MALICIOUS

PDF

39.0 KB Created: 2020-08-22 05:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e63d48068265bdd47a4fda56c80d87c SHA-1: f2b277b705191b30ef9ad50a37a0f18d50614e09 SHA-256: 53363210abd0229257de26a30f28ed9688258b52b642df12583d7a94720a5d33
152 Risk Score

Malware Insights

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

The PDF contains a prominent link to 'Hays legal salary guide 2019' which, upon inspection, redirects to a malicious URL. This indicates a phishing or social engineering attack aiming to lure users to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the embedded malicious link is the primary indicator of compromise.

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=hays+legal+salary+guide+2019
    • http://roxizal.forevershizuka.com/uploads/1/3/1/4/131453293/976840.pdf
    • http://files.sarahobrienhart.com/uploads/1/3/1/8/131871535/bilarepizadol-kulisomomerim-norax-tunam.pdf
    • http://files.techsun-breakrooms.com/uploads/1/3/1/3/131379622/b84ae.pdf
    • https://cdn.shopify.com/s/files/1/0432/9131/2288/files/bisit.pdf
    • https://cdn.shopify.com/s/files/1/0433/2650/5128/files/benim_hocam_trke_konu_anlatm.pdf
    • https://cdn.shopify.com/s/files/1/0434/5020/4316/files/apc_back_ups_es_750_manual_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0434/7170/0120/files/xufiwuxijegev.pdf
    • https://cdn.shopify.com/s/files/1/0439/1626/3592/files/bunnings_fibre_cement_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/9872/4769/files/95667880011.pdf
    • https://cdn.shopify.com/s/files/1/0432/6175/5547/files/efek_samping_bleaching_gigi.pdf
    • https://cdn.shopify.com/s/files/1/0435/9464/5672/files/f150_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/2007/4657/files/power_amplifier_classification.pdf
    • https://cdn.shopify.com/s/files/1/0460/1557/8279/files/50209599428.pdf
    • https://cdn.shopify.com/s/files/1/0428/2790/7239/files/muriwopopebetilavo.pdf
    • https://cdn.shopify.com/s/files/1/0434/8100/6244/files/wesafarukuwetiludujiko.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4040/files/precalculus_functions_and_graphs_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/8872/3616/files/xosifutosupiniw.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_off000058bb.bin
263761bbb63fe9fd03d5f4e06358e98536a4145058b89f89c86aa6d87e3509f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58BB 5536 bytes
font_01_sfnt_off00006b9f.bin
c8e5a73c804a427911cd28f5c73cc4b090818387b2763d9458e9a328d4b5fa96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B9F 10384 bytes

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