Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd816e9b6f25a14…

MALICIOUS

PDF

40.9 KB Created: 2020-08-23 00:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1dfb9c860b46fcd115c366826d25103a SHA-1: 3f989880b44fa952a6d58f896ab100a406ba8a74 SHA-256: 7dd816e9b6f25a144b5dc6cf1b3033cd67378c6c9736642f2127ddb58695def9
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links, including a critical finding of a link to a known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=game+catur+online+terbaik+android'. The document body, though partially corrupted, suggests a lure related to online games, and the presence of a 'Download Now' heuristic further supports a deceptive download attempt. The PDF also hosts a link farm of other PDFs, indicating a potential effort to distribute malicious content or engage in SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=game+catur+online+terbaik+android
    • http://files.businessbox.ch/uploads/1/3/2/7/132740435/8828096.pdf
    • http://biwemud.jhuxster.com/uploads/1/3/2/6/132683001/duzum_pobemefe_famomuxekofu.pdf
    • http://wufasozi.abbyfeiner.com/uploads/1/3/2/8/132815787/78baf70799.pdf
    • http://mosesub.stcatherineschurchlittlehampton.org/uploads/1/3/0/7/130776433/budolazifi_nodezedaviro_kosob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4837/8280/files/78339118624.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/zowavakikesumejinaxopa.pdf
    • https://cdn.shopify.com/s/files/1/0433/9813/5971/files/22342828815.pdf
    • https://cdn.shopify.com/s/files/1/0435/5656/9249/files/51346452483.pdf
    • https://cdn.shopify.com/s/files/1/0441/0313/9480/files/leluwudup.pdf
    • https://cdn.shopify.com/s/files/1/0440/6879/8614/files/dogef.pdf
    • https://cdn.shopify.com/s/files/1/0430/3077/3913/files/67666581862.pdf
    • https://cdn.shopify.com/s/files/1/0431/5129/4619/files/air_pollution_sampling_and_measurement.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/40330164471.pdf
    • https://cdn.shopify.com/s/files/1/0431/1554/4737/files/33814246911.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000637c.bin
9775ba06fc2d6d6d625d6ad19be63f9091aa290deff73f92d94c65a4d9a02b85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x637C 5144 bytes
font_01_sfnt_off000074e5.bin
e84c962c7d851b69ec4cd8ef764ba9d62d2e7f64e2bb1305aacc1d8da3f5aa8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74E5 9964 bytes

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