Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d41984ed1c8b5d…

MALICIOUS

PDF

45.5 KB Created: 2020-10-09 05:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 697c3d009dd8e0765724c6e0f56d5a93 SHA-1: 1962b4c4fd0b64d688aa1e00b44d85018d87436b SHA-256: 11d41984ed1c8b5d0997a5e0612c43c4dc8e49e3418e1c0537c29d8a8dea3d55
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed to distribute malicious content. One prominent URL, 'https://ttraff.link/pify?keyword=city+select+double+stroller+lux', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text mixed with URLs, suggesting an attempt to disguise the malicious links.

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.link/pify?keyword=city+select+double+stroller+lux In PDF document text
    • https://site-1038879.mozfiles.com/files/1038879/pomezimabovoxi.pdfIn PDF document text
    • https://site-1040687.mozfiles.com/files/1040687/zolisaramel.pdfIn PDF document text
    • https://site-1036640.mozfiles.com/files/1036640/38654291704.pdfIn PDF document text
    • https://site-1044312.mozfiles.com/files/1044312/35588863293.pdfIn PDF document text
    • https://site-1039131.mozfiles.com/files/1039131/45317181783.pdfIn PDF document text
    • https://site-1038556.mozfiles.com/files/1038556/77267895888.pdfIn PDF document text
    • https://site-1038505.mozfiles.com/files/1038505/27335863389.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/1/0440/5703/4902/files/life_size_barbie_dream_house.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4849/2438/files/xtrememac_tango_trx_bluetooth_not_working.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9493/2640/files/prefijos_y_sufijos_ejercicios.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0878/9150/files/lajosesurukoxudurabod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/3159/3895/files/podikaxisufavegimiwedenix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1636caa1-ea06-415b-9e4a-25e2aaecc952/bofimeviwes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c5eec72-8f2a-4d73-941e-0527f76f78e0/delozuxubiwikagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ffbd3ab-8fe5-44c9-b0ab-04d1127626f7/gorofepanafiwakoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0cb132e-f5d7-494d-b273-5c477d505317/58884478297.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66DA 4936 bytes
SHA-256: a8273b1907b2f37a594567f74104a75371c6b2d682b7ecad7d6ff52aeae196d1
font_01_sfnt_off0000777c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x777C 6184 bytes
SHA-256: 9a1ef56244312dc7e0b41543f993f1c51f166f5ccb3286402c97dd46e1198e80
font_02_sfnt_off00008676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8676 10008 bytes
SHA-256: 4b9e3423eaab1bcbf7edb12136e181641e5da6389db1f949f87f1e270bedf17d

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