Malicious PDF — malware analysis report

Static analysis result for SHA-256 253687aa85a1c30d…

MALICIOUS

PDF

71.2 KB Created: 2020-12-20 10:36:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 45ca9280d80520ba11fdce6758fda9c6 SHA-1: e4d0b5e7f49d0f3ad256b51208b84a4dc692bc34 SHA-256: 253687aa85a1c30dfa07b867f7086447c0f80faa5f7fac8ee3c8dd46387f6021
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure (ggtraff.ru). The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate a strong likelihood of malicious intent, likely for phishing or driving traffic to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/strik?utm_term=book+of+ancient+secrets In PDF document text
    • https://cdn-cms.f-static.net/uploads/4465006/normal_5fbdc97fb81e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448991/normal_5fbfdbed023a2.pdfIn PDF document text
    • https://wufenimikefi.weebly.com/uploads/1/3/4/3/134366244/2837909.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc68db56609fd0ee7b8a05a/t/5fd5fa79d654060362bccdcf/1607858811096/wifi_signal_booster_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97b8d980-bbe0-4534-adaa-89ec24973310/writing_compound_inequalities_worksheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0eb79e5c7695ca99bb922/t/5fc4b81a1972c46e3c326619/1606727707100/jikigodizaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84bf11c3-1c00-49dc-817c-df3217108af5/zoxemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e223140-0710-4fff-acda-bf805e679e66/diary_of_an_oxygen_thief_downloa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86f3297a-2f23-405b-87a4-c4d54a80fc1e/54164999951.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc151a0e2fce462bc8ed0ee/t/5fcb1cd0a0b42e3566a295cf/1607146705100/31867345493.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1771924b06a7eb3033110/t/5fc62fbef81c9a2a0c7657e4/1606823874025/shadow_the_hedgehog_phone_wallpaper.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1412bcd1e280355d6a3a9/t/5fc329d33485235c862e67fd/1606625748045/sezisakiforawuvufaka.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_off0000da4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4E 4956 bytes
SHA-256: d00b246b318a803ca466b273133563655de8a244a7cb48641b25f17b9a1a2806
font_01_sfnt_off0000eb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB41 10704 bytes
SHA-256: 6b60afdaa0557f9cbf1be5003c67c26bdbcb8361850f7a2638a0ca53f7255583

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