Malicious PDF — malware analysis report

Static analysis result for SHA-256 842d57b9d7ee4670…

MALICIOUS

PDF

68.1 KB Created: 2020-09-01 09:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 19b77bc1c1bf5b9e3c9ebbed592fddb2 SHA-1: 50e0886eac7b0893368561cd03563d20662221c2 SHA-256: 842d57b9d7ee46701064a3edd02efd20c21b1f72d8b972d3e2a5353c5f185ecc
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, identified as malicious, which is disguised as an employment report. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, suggesting a phishing or spamming operation. Although no scripts were explicitly extracted, the presence of embedded URLs and the malicious redirector strongly suggest an attempt to lead the user to a malicious site.

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=columbia+business+school+employment+report In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_30bda6cbade347fe9b4b4577d96426f8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/89363e_8d2d9d6b6d404e1d900f54c2e569c3a1.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3be3a7_3f4cbdd780ec4654af45cd1af46c8ca3.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ee6770_fe29a16b2b5e400f89193c91301d3648.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f0f215_2acb188b39d14ade8314927cb44d095f.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2639/0946/files/18964105096.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9672/7962/files/bedapat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5289/9231/files/gazafumenevirisixa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/luwewezirigoleze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4750/8385/files/70542582641.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4185/7448/files/pure_culture_techniques_microbiology.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/6924eb_3db486f4b3db4d4d831f1d6e583197de.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/48d9a1_3360093a64fb42668767bf273fe54d7a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/16a96a_2201a716789045ad880194f7bc34d10a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/87a178_c860dd40edd3473fab423e25d83d42c8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/764aaa_c80d24153fc941da89e4bd7d737eabbc.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_off0000c716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC716 5320 bytes
SHA-256: 3e7d06a20a5611998366dd8de55b5968515ead521bbd56fa3344a70c413ff91e
font_01_sfnt_off0000d8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FF 13276 bytes
SHA-256: 65d63ea1596fa766085950da85289904387a4decca7919fa3c115955964c7ab1

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