Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9badf0c554196f1…

MALICIOUS

PDF

53.6 KB Created: 2020-08-06 02:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30c372bef881d7d7ef9118a76d1411e4 SHA-1: a9a3778125fe026352739ccea9b6b061679debcd SHA-256: b9badf0c554196f113de46ff6e782c2e88842145c462cb3a9769a8a946b71c38
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a large number of embedded links, many of which point to a redirector service. This suggests a phishing or social engineering attack where the user is lured to a malicious website. The primary malicious IOC is the redirector URL, which likely leads to a more harmful payload or phishing page.

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.com/wb?keyword=scanner%20brother%20ads-2200%20pdf
    • http://files.teamfitnessonline.com/uploads/1/3/0/8/130813357/7888941.pdf
    • http://files.sonasasia.com/uploads/1/3/1/4/131437711/6138187.pdf
    • http://files.pgpropsandmodels.com/uploads/1/3/1/3/131380728/tatok_xapejokixawe_xekap.pdf
    • http://files.paulspipes.com/uploads/1/3/1/3/131379894/88aaf03.pdf
    • https://cdn.shopify.com/s/files/1/0431/1695/3767/files/rutekegewanawokalivusilo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9270/4408/files/xabuxobara.pdf
    • https://cdn.shopify.com/s/files/1/0433/0510/7620/files/sportsman_s_guide_coupon.pdf
    • https://cdn.shopify.com/s/files/1/0435/3048/5912/files/manibopi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9869/files/fundamentals_of_electromagnetics_with_engineering_applications.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dojezurin.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/25424470269.pdf
    • https://cdn.shopify.com/s/files/1/0429/1765/8780/files/31006668995.pdf
    • https://cdn.shopify.com/s/files/1/0435/5509/4677/files/96784983164.pdf
    • https://cdn.shopify.com/s/files/1/0432/0952/3355/files/tebodigojazixesolebetuju.pdf
    • https://cdn.shopify.com/s/files/1/0434/5495/5672/files/88903245737.pdf
    • https://cdn.shopify.com/s/files/1/0441/2545/4488/files/10041249217.pdf
    • https://cdn.shopify.com/s/files/1/0435/1026/8064/files/81670338235.pdf
    • https://cdn.shopify.com/s/files/1/0432/6418/0390/files/46879826172.pdf
    • https://cdn.shopify.com/s/files/1/0441/2620/8152/files/72076928509.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00006772.bin
71a62abe96400c3eeefe8a078dd56e00a179fc1adc99d21d08d5000bdbda5b76		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6772 10800 bytes
font_00_sfnt_off000053e9.bin
4b1f23b94e93d1fb9366262bd6d1b9f7d8554c7acfd944620c33ef93919f27cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53E9 5760 bytes
font_02_sfnt_off0000864d.bin
03de89a328d01dc883c7aacd133177747b8a1e7de24826373c0361ff692dffce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x864D 12948 bytes
font_03_sfnt_off0000aff4.bin
c35e676b04b51d868c0dd1a28f60f844b1ebaaddcaddbca6a68097dc656b2e0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF4 17244 bytes

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