Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88e4b7a18d4e0e3…

MALICIOUS

PDF

41.9 KB Created: 2020-09-04 00:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 344c9886abfd0938210b13f410680d66 SHA-1: 7c3ba836aa80ad1504c4e7773ed065f99a777f57 SHA-256: e88e4b7a18d4e0e3b4468bc8ee8553dcdc9aca57eb8724e3aa2edffc714345d5
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with a critical heuristic identifying it as a PDF SEO link farm. One of these links, https://ttraff.com/wix?keyword=ibm+aspera+connect++for+mac, is known to redirect to malicious infrastructure. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to a malicious site. The presence of numerous benign-looking Shopify links likely serves to camouflage the malicious redirector within a larger link farm.

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/wix?keyword=ibm+aspera+connect++for+mac
    • https://cdn.shopify.com/s/files/1/0432/0709/8529/files/practical_reliability_engineering_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8188/files/small_shirogane_castle_walls.pdf
    • https://cdn.shopify.com/s/files/1/0433/4610/0377/files/49874971523.pdf
    • https://cdn.shopify.com/s/files/1/0432/0441/1556/files/xibaganukuvajojipi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0835/files/1501860613.pdf
    • https://cdn.shopify.com/s/files/1/0432/9766/9278/files/fluorometric_determination_of_quinine_lab_report.pdf
    • https://static.usrfiles.com/ugd/b444d4_aa14d74be9ef4e2da53f62596b8be707.pdf
    • https://static.usrfiles.com/ugd/0a84ca_cbb09149ae2f4d77bbdf9d67afd43965.pdf
    • https://static.usrfiles.com/ugd/ab63e3_82d6c387771c4a9fa7883b034f109d07.pdf
    • https://static.usrfiles.com/ugd/4c1554_0972811f71354f4ca9c3ae047dddde82.pdf
    • https://static.usrfiles.com/ugd/de60da_faf336b9b416406f87d009469d65786f.pdf
    • https://static.usrfiles.com/ugd/41f880_60927ae5e6f448eda6910bcf598d0c12.pdf
    • https://static.usrfiles.com/ugd/d7c203_8fa81def041f4da5bddf839418368e08.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e0f500d713148e38461148786b0980f.pdf
    • https://static.usrfiles.com/ugd/238140_9c2551896b1b446782f5d37e86a6773e.pdf
    • https://static.usrfiles.com/ugd/ef7b09_16fac16ee9fa45928a0d362e3827a344.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064fb.bin
730e64355a1b25cfa7580022b86cca12fd000bb307a09978212cfbddf6e391aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64FB 5208 bytes
font_01_sfnt_off00007696.bin
f71cb4a541340f1e847f9c83c67aa5f7f59e325959604f58d331afce9d2357d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7696 10528 bytes

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