Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ddefd076bce6d73…

MALICIOUS

PDF

42.4 KB Created: 2020-10-27 16:44:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d636a89374ad4884a81f0825d5ba9cf0 SHA-1: 2c220157417a90bb3781660b4c1a1e0b00676174 SHA-256: 4ddefd076bce6d738d738bdf1dbc454fab8472124e190973433420919ee41b9a
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link to a known malicious redirector, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains text that suggests a lure related to 'Healthcare sector outlook 2017'. The presence of a large number of external PDF links, many of which are to benign Shopify domains, suggests a link farm or SEO poisoning attempt to increase the visibility of the malicious redirector.

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://cctraff.ru/strik?keyword=healthcare+sector+outlook+2017 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387718/normal_5f94f46e94482.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370073/normal_5f945644ec47a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369629/normal_5f88823596db9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5f874c2bd4bc2.pdfIn PDF document text
    • https://fupexorugukemig.weebly.com/uploads/1/3/0/8/130814763/nusilekaz.pdfIn PDF document text
    • https://xedaliwim.weebly.com/uploads/1/3/1/4/131454603/7534926.pdfIn PDF document text
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/d07c425542415c.pdfIn PDF document text
    • https://kusebedanosude.weebly.com/uploads/1/3/1/1/131163667/dabiviko.pdfIn PDF document text
    • https://gejimedetudumi.weebly.com/uploads/1/3/3/9/133997730/4adae1fd674.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/dubafefosunuji-fexupaxegitu-vobizebefumoton-mujajumuvor.pdfIn PDF document text
    • https://nofakefol.weebly.com/uploads/1/3/4/3/134341926/wogada_pekimananorax_puvobefateva_kozekakurizofo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8537/4642/files/12_most_common_themes_in_literature.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7877/9047/files/kinakuxilegoxuzexuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5067/1514/files/bathroom_heater_fan_not_working.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8317/9198/files/55828580154.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8937/2329/files/jujuronalakekopepit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3096/1054/files/fowomokunifojora.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4397/7888/files/keyence_laser_sensor_il-1000_user_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/3876/1109/files/durjoy_datta_novels.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9446/4929/files/mindray_ventilator_sv300_manual.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66DF 5316 bytes
SHA-256: 5a33faad82ca1a8e13a99eebbf9c96e4025ee85c05757019de278ab0e7058117
font_01_sfnt_off000078f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78F0 10296 bytes
SHA-256: 5851a5a52fc78e891eccea22a237c729b7ed7c1b9e5f650757c8a2e246ee8dd7

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